What were prior years like?

I find those numbers a little suspicious. The volume of total retail software sold on Switch is 994 million—around. Approximately 400.52 million of those are developed by Nintendo. And I just don’t buy that Xbox Series X/S and PS5 are outselling Switch by that much in third party sales. Particularly when third party sales have only increased in volume since the Switch launch.

I’d like to see a breakdowns of their numbers to see how they managed to get such wild looking numbers. Are they sampling in specific markets? Only specific companies that might not have that much software on the Switch? What’s going on here?

This. When they released Chinatown Wars on the DS, its sales figures were absolutely pathetic. Then they put it on the PSP, and it quickly sold like gangbusters. They haven't really bothered with Nintendo's platforms since 

Yes after looking into the fiscal year info from Sony and Nintendo I don't see how MS figures add up for 2021. My guess is that this figure is not actually for 2021 only but is in fact adding together lifetime 3rd party sales for PS4+PS5 vs XBO+XS vs Switch as of the end of 2021 (or FY 2021?).

The chart shows PlayStation selling over triple the 3rd party software of Nintendo but in 2021 it was actually around double not triple.

Just curious, who provided the data for that chart? Microsoft? Or are those the numbers provided by Sony and Nintendo themselves? 

These numbers are taken from the Sony/Nintendo fiscal year explanatory/supplemental information releases.

Sony reported total and 1st party software for the last 3 fiscal years but only total software before that.

Nintendo report total software and then report first party sales for games that sold at least 1m in that fiscal year. Hence the Nintendo 1st/3rd party numbers being greater than and less than. As there'll be 1st party games that sold under 1m that year that aren't included in the 1st party figure in the table.

For the latest releases:

Sony - FY21_4Q_Supplemental (sony.com) (Page 9)

Nintendo - 220510_6e.pdf (nintendo.co.jp) (Total software on Page 10, 1st party on Page 17)

I think it mainly probably just boils down to GTA Online not being something that can run on the Switch easily and that's probably what Take2 wants revenue wise (they want people who buy GTA to channel money into the online component). Because they've been selling the mainline version of GTAV for dirt cheap for ages now, I think I bought it on Steam just on a whim for like $15. At this point I think the sales of the regular version of the game are kinda gravy for them, but they want the option of every GTA5 buyer being able to go into the Online version. 

If GTA VI can run on Switch 2 without massively compromises, that will be interesting whether they port or not. 

Not on consoles, they barely changed the price and people are eating this for generations.

But yeah, their online is definitely more profitable despite that.