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It is indeed SteamOS, though they're claiming that Proton will be improved for this:

> For Deck, we're vastly improving Proton's game compatibility and support for anti-cheat solutions by working directly with the vendors.

I noticed one of the screen shots was using KDE on the connection to another screen. Honestly that got me to realize it's another PC and made me consider getting one. Worst case scenario, I just have another PC that's marginally better than those small box office PCs.

Edit: I read further, it is a fully fledged PC. You can install or do whatever you want to it.

It is! A new version, in fact. It includes Proton.

(I'm not sure if SteamOS v2 and below were already Arch-based, but it's interesting to know that v3 is, given that the Steam Linux Runtime is mostly Ubuntu-tested)