For Elden Ring, that is only one nation.  In Japan, the situation was reversed and PS4 SKU of Elden Ring sold about 3 times what the PS5 SKU sold.  You are going to need more data than just one market.

PS4 Pro sold about 20 million or so.  There are some people who want a hardware upgrade, but it isn't anywhere close to the majority.  Some of it is also branding.  The most hardcore Playstation fans will buy one even if it has few new games just like hardcore Nintendo fans bought a Wii U the first year or so.  Although PS5 is really more like N64 than any other system.  N64 sold really well for the first 1-2 years and then sales plummeted.  Nintendo had always been the market leader up to that point, so that was the system people bought in anticipation of games that would be coming out.  After the early adopters bought the system they assumed would be best, the mass market went for Playstation.  Something similar is happening right now.  Hardcore PS4 fans are buying PS5's, but soon sales will run out and it will be obvious that a lot of people have switched to Nintendo or XBox.

As for instantly selling out, that is because there is a chip shortage and a lot of scalpers.  Supply is limited.  Scalpers are taking advantage of this worldwide and buying all PS5's as soon as they are in stock.  This is not like the Wii's situation though during it's first few years.  There was no chip shortage with the Wii.  It was hard to find, because demand was far higher than Nintendo anticipated.  Wii = excessive demand.  PS5 = limited supply.  PS5 is not selling Wii numbers.  It's not as popular as you seem to think.

Do you have numbers for Elden Ring by platform?  My understanding for GT7 and HFW is that they are often bundled with the PS5 in certain nations.

The data is more muddled than I thought but the PS5 version of Elden Ring did outsell the PS4 version in Spain I think. You say later that there are some people who want a hardware upgrade so if you recognize that it's at least some then that's fine. I'm not saying and I don't think anyone else is saying that the main reason the PS5 has been selling is cross-gen games, just that it's one of the reasons since cross-gen games do still sell hardware even if the effect is diminished. Just cause we're saying it's a factor doesn't mean we think it's the main factor, you just seemed to be denying that it's a notable factor at all when it is one. Right now the main reason for it selling is brand power and next year exclusives and gen 9 multiplats will start to increase as a factor.

As I've said before, crossgen games are like ports.  Ports are better than nothing, but who wants a system of only ports?  Likewise if I said, "the Wii U didn't sell", that doesn't mean that I think it literally sold 0 units.  It means that it didn't sell well.  Context matters.  "Crossgen games don't sell hardware" really means "crossgen games do not sell hardware nearly as well as a game that would require you to buy a new system".  The Vita had a lot of ports and crossplatform games.  It sold more than 0 units, but it didn't sell well.

I entered this discussion when curl-6 said something like the PS5 could sell 30m units per year if supply were enough.  I do not think PS5 demand is nearly so high.  In fact, I think supply will catch up with demand this year in spite of chip shortages.  There is this perception that the PS5 is in demand like the Wii was.  I don't think that is the case at all.  The Wii would continue to sell out, because demand was far greater than Nintendo anticipated.  The PS5 is selling out because of limited supply. 

Wii = excessive demand.  PS5 = not enough supply.  I'm using Economics terms.  These are two common ways for the price of a product to go up.  Either increase demand or decrease supply.  In a video game market either situation could cause an entire shipment to be bought and scalped at a higher price.  The PS5 doesn't have amazing demand like the Wii.  It has limited supply.

I am not sure how well is selling PS5 when it is doing less than what PS3 did in 08 in the same time of the year. In fact PS3 was all over the news and the web back then for selling poorly. And now all of a sudden PS5 is doing 500k less for the year till june and is selling very well ? I doubt it.

But of course we all know the reason the shortages..

I personally think when this is fixed PS5 will be selling maybe PS4 levels for 1-2 years, then go somewhere between PS4 and PS3 levels weekly.

Maybe doing somewhere between PS3 and PS4 lifetime if Sony plays their cards right until the end of the generation.

As I've said before, crossgen games are like ports.  Ports are better than nothing, but who wants a system of only ports?  Likewise if I said, "the Wii U didn't sell", that doesn't mean that I think it literally sold 0 units.  It means that it didn't sell well.  Context matters.  "Crossgen games don't sell hardware" really means "crossgen games do not sell hardware nearly as well as a game that would require you to buy a new system".  The Vita had a lot of ports and crossplatform games.  It sold more than 0 units, but it didn't sell well.

I entered this discussion when curl-6 said something like the PS5 could sell 30m units per year if supply were enough.  I do not think PS5 demand is nearly so high.  In fact, I think supply will catch up with demand this year in spite of chip shortages.  There is this perception that the PS5 is in demand like the Wii was.  I don't think that is the case at all.  The Wii would continue to sell out, because demand was far greater than Nintendo anticipated.  The PS5 is selling out because of limited supply. 

Wii = excessive demand.  PS5 = not enough supply.  I'm using Economics terms.  These are two common ways for the price of a product to go up.  Either increase demand or decrease supply.  In a video game market either situation could cause an entire shipment to be bought and scalped at a higher price.  The PS5 doesn't have amazing demand like the Wii.  It has limited supply.

Here is my personal confusion, a summary of two statements from you are below:

1) ps5 doesn't have true exclusives

2) true exclusives sell hardware

The problem with statement 1 and 2, is the ps5 is in fact selling very well.  So one of your two statements, by default, has to be false.  

One problem is that this isn't my argument.  I am talking about crossgen games and not "true exclusives".  Another problem is that the PS5 isn't actually selling well.  For a while it was the "fastest selling console of all time".  Now it's behind the Wii, PS4 and Switch launch aligned.  Its sales rate has cooled off significantly.  A third problem, one that hasn't really been discussed yet, is that PS5 has some really hardcore competition this time around from both Nintendo and Microsoft.  Even when it gets some good software, like FF16, that may not help a whole lot, because the other systems may still look more attractive to customers.  Those other systems can get good software too (and in fact the Switch already has a ton of great selling software).

PS4 Pro sold about 20 million or so.  There are some people who want a hardware upgrade, but it isn't anywhere close to the majority.  Some of it is also branding.  The most hardcore Playstation fans will buy one even if it has few new games just like hardcore Nintendo fans bought a Wii U the first year or so.  Although PS5 is really more like N64 than any other system.  N64 sold really well for the first 1-2 years and then sales plummeted.  Nintendo had always been the market leader up to that point, so that was the system people bought in anticipation of games that would be coming out.  After the early adopters bought the system they assumed would be best, the mass market went for Playstation.  Something similar is happening right now.  Hardcore PS4 fans are buying PS5's, but soon sales will run out and it will be obvious that a lot of people have switched to Nintendo or XBox.

As for instantly selling out, that is because there is a chip shortage and a lot of scalpers.  Supply is limited.  Scalpers are taking advantage of this worldwide and buying all PS5's as soon as they are in stock.  This is not like the Wii's situation though during it's first few years.  There was no chip shortage with the Wii.  It was hard to find, because demand was far higher than Nintendo anticipated.  Wii = excessive demand.  PS5 = limited supply.  PS5 is not selling Wii numbers.  It's not as popular as you seem to think.