Using Windows 11 for this just seems like an awful idea. They're using an already shaky OS that Microsoft has a tendency to force updates to that cause problems on desktop PCs - who knows what it'll do on something like this? Windows is also a resource hog, not what I'd choose for a presumably light-weight machine.
Windows is also not particularly great about sleeping / hibernating and resuming while games are running... that's really the greatest feature of the Steam Deck, in my opinion - just like a handheld console, you can turn it off at any point and resume your game flawlessly, in almost all cases.
Hopefully they're at least building a custom front-end for it. If they're expecting users to navigate using the normal Windows interface (or Windows' tablet interface, maybe), that's another huge problem.