Got this from a post on the alien site. From previous discussion on Lemmy it sounded like Linux users had good things to say about this game but were discouraged about the upcoming FaceIt implementation such that they wouldn't be able to join anticheat enabled matches. Those users and Linux gamers on the fence would probably appreciate hearing this news.
With this announcement on the dev team's community Discord, it appears Linux users will NOT lose access to matches with anticheat.
[EN|CN] PoM (Moderator shield) Today at 16:23
Just announced on [Stage Channel] there will be a new version of FaceIT that supports Linux!!! (Popular version of Linux and SteamDeck will be supported) And different than the CSGO version. BBR will be the first game to be using that version (A more casual version)
Almost certainly means they will only actively support one distro. But of course, all distros can run the same software, it just may need to be packaged manually by distro maintainers. Most proprietary software only officially supports Ubuntu. Even Steam only officially supports Ubuntu outside of SteamOS.
My best guess would have been that they mean Ubuntu, since thats what companies usually use in tutorials/develop for. But since they also want to include the steam deck, they must also mean arch. With Arch and Debian (probably) covered, im not too worried about compatibility.
To me it sounds like that will mean most of them, they just don't want to commit to saying all because there will always be another distro they missed.