We are talking about the past aka November and there was news of switch getting a real stock boost in Japan recently so how does the availability of today inform us about November? The numbers for December are still up in the air.

Black Friay is a non event in Japan though? And now that there a enough stock in December it's doing great numbers over there but not blowing past records so I don't see how it would have changed anything back in November. The people who couldn't buy it one month ago are buying it now.

And it was widely available and still is in Europe.

Nintendo doesn't need to prioritize Japan since there is no longer any company that competes with them there.
They could sell far more hardware if Ring Fit and New Horizon bundles were widely available, but I'm venture to guess they would prefer to be slightly up YOY and have more stock for next year where they will blow Q1 2020 out of the water. 

TOP 10 2020 Switch Famitsu Q1:

1. Animal Crossing: New Horizons - 2.608.417
2. Pokemon Sword / Shield - 554.390
3. Ring Fit Adventure - 249.488
4. Pokemon Mystery Dungeon: Rescue Team DX - 218.394
5. Minecraft - 185.900
6. Mario Kart 8 Deluxe - 181.921
7. Smash Ultimate - 170.222
8. Dr. Kawashima's Brain Training for Nintendo Switch - 151.351
9. Super Mario Party - 118.077
10. Luigi's Mansion 3 - 117.482

SOFTWARE TOTAL: 4.555.642

HARDWARE TOTAL: 1.700.352

In other regions like Europe and North America they need to ensure Switch maintains mind-share during the holiday as the new consoles launch and they've been pretty aggressive especially in Europe around bundles and pricing. While they also need to ensure they supply enough for Other markets which is their fastest growing regions. In Canada for example Switch is set to double PS4's best selling year, this could happen in several western & asian countries actually. 

Setting hardware records in Japan during 2020, isn't all that important in the grand scheme of things when they have 85% of market share for hardware and software for the year; their revenue will surely shatter some records without much problems. Since this doesn't account digital which has been growing due to their voucher program being really good value in Japan. 

That's an interesting chart.  I do wish NES numbers were on there, but Switch is steadily heading toward those levels.  In the NES/Famicom days, not only did Nintendo dominate the market, but there was no handheld market either.  They really didn't even have any decent compeitition until the PC-Engine was released, and even then the Famicom kept going strong. 

By contrast, the lowest performer on that chart was the PSP in 2011 with 26%.  Think of all the systems selling in Japan that year: PSP, DS, 3DS, Vita, Wii, PS3, XBox360.  All of those systems, except maybe the XBox360, were claiming a decent sized chunk of the software market.  But in the current climate there isn't really a dedicated handheld only console market.  Nintendo shoved Sony out of the handheld market, and they consolidated their own business to shove Sony out of the home market in Japan too.  They have one console to rule them all.  The market in Japan is starting to resemble the Famicom days again.

So the Playstation family sold 569k for Black Friday week, when was the last time it was that low, if ever? Certainly not in the PS4's life. Launch of the PS3 maybe? But even then they had the PS2 to boost their numbers.

We haven't gotten the numbers after restock though. That will happen on Thursday so how do you know how much it's selling? Plus I still haven't gotten any sources about how much it's available in Europe. Can you provide any reference on how the stock situation has been in Europe over the past few months? I don't even know whether it's out of stock or in stock or restocked in Europe as I have not seen any news regarding the matter.

I wonder if they just got caught at a bad time with this years demand, they were maybe winding down production of PS4 before the March/April increase in sales, then suddently everyone is buying them and they needed to focus on PS5 manufacturing, so they weren't able to ramp up PS4 production again.

That's actually a pretty likely explanation. The PS4 stock they expected to have for the holidays was snapped up earlier in the year, and then they needed to reallocate their manufacturing capacity to PS5.

No. will change everything because since may switch was supply constrained. 

Amazon France

Neon have only with scalpers 

Grey have yet