It does, however, still work quite well with the Windows version via Steam Play Proton on desktop Linux and is Steam Deck Verified against the Windows version in Proton. So while it’s a loss of support for their Native build, it’s still fully playable on Linux.
Opposed to most other people here I would like to say that making your game support dependent from a software that 95% won’t be able to install or use without getting a partly closed source DRM “app-store” software is - in my book - a bad idea.
Won’t buy any games that have no native support.