All the developer needs to do is push a button to make EAC work. They’re probably busy hotfixing the 1.0 but I’m sure it’ll work soon, they are excluding all steam deck users by not pressing it
Edit: apparently it’s not EAC that is the problem. The game has its own anti-cheat which also potentially bans your account if you try to play on linux www.protondb.com/app/2073850