

They are countries that do not have PSN access. As Sony wants to make PSN accounts mandatory on PC, they got in hot water for selling their games in countries where you can’t legally even have a PSN account.
In response, they blocked sales in all those countries.
You don’t need Bazzite to use the “steamdeck-like” interface. Any distro with steam will let you run Steam in “big picture mode” which will let you control steam with a controller.
That said, Bazzite will work fine, but you’ll likely want to run it in desktop mode, rather than game mode. RPCS3 is just nicer to use this way, as it’s not really meant to be navigated using a controller. Once you have your games set up, of course, you can play them with a controller.
As for running PS3 games, that should work fine. Your performance will likely vary from game to game, but a Ryzen 5 is “pretty good” for PS3 emulation.