Bad news: Playstation is starting to block their games from running on Proton. Playstation Overlay is blocked on Linux in Ghost of Tsushima. The same thing happened with the Concord beta.
Headline is misleading since it gives impression Sony is intentionally going out of their way to prevent the game from working through Proton, but this is more the case of multiplayer component not working.
AFAIK the multiplayer was working for Playstation titles, so much that some of them got the verified check and that's supposed to only be given if everything works. So yes, they're purposefully breaking it by adding a dependency on (probably) kernel level anti-cheat, since any other Windows API could be converted by wine (but kernel level apis are purposefully checking if it's being run on wine to throw an error)