I think there's a little error on the PS4's last YTD sales. Or did it really sell that bad back then?
It's accurate. For the first 44 weeks of 2022 PS4 only sold a total of 722 units, and then during the last 3 months sold 22k more.
It seems there was no PS4 stock but Sony began shipping small quantities of PS4's again to Japan starting with the holiday quarter of 2022. That's the only explanation I can come up with.
Kind of lines up with the reports Sony was planning on axing ps4 production at the end of 2021, but then in January 2022 we got reports they were going to produce another 1 million PS4's. Sony Tackles PlayStation 5 Shortage by Making More PS4 Consoles - Bloomberg
Though was a long wait between that report and supply appearing in Japan.