Please fix this if at all possible. The Steam Deck is very popular and one of the only console-like experiences on PC. The Steam Machine will be releasing soon and the next generation of Xbox is extremely likely to be a PC-hybrid of some sort so hardware bans for these don't make a lot of sense. There is no other way to safely play BO2 multiplayer anymore, it sucks to be blocked off from it entirely because of bad actors that.
I also hope the extremely entitled, obnoxious people in this thread hurling insults at free contributors didn't affect any decisions, they do not speak for Deck users whatsoever.
I also have to disagree with the post directly above me. I don't think the Steam Deck is comparable to random hardware and it's popular enough that there would be no reason for someone to assume it wouldn't work when Linux in general does. Especially when this is not a compatibility issue.