The fact is that they are rebranding it to Steam Deck OS.
As far as I know they’ve said nothing about that. It’s reasonable to say that the title is a typo for a couple reasons.
Two use cases for the OS that have nothing to do with Steam Deck, so “Steam Deck OS” makes no sense as a name. I personally think they are waiting for Plasma 6+HDR support+VR support before they ship a desktop version, it’s important to have feature-parity with Windows out the gate for good word-of-mouth.
Ok, not a typo. Other than the title of these patch notes, is it referred to as “Steam Deck OS” anywhere else? On Preview branch the distro still says “SteamOS Holo”.