It does, kinda, there are warnings for games that require certain things like kernel level anti-cheat or 3d party accounts, although I think they should have an extra one for always on DRM which is particularly nasty and troublesome for people on a steam deck so there's reason for them to warn on that.
But also, you have 14 days to return a game as long as you have less than 2h of play, if this is a major concern for you you can run the game offline and ensure it works otherwise refund it. There are also unofficial curators run by community that allow you to quickly see if a game is in those lists which is a nice community way to ensure weird cases are captured. Still would be nice to have more official stance from Valve on hard DRMs, hopefully with GoG coming to Linux they might have to care more about it, but we'll see.