SteamOS now released officially for any device
store.steampowered.com
store.steampowered.com
We are working on broadening support, and with the recent updates to Steam and SteamOS, compatibility with other AMD powered PC handhelds has been improved. If you are interested in trying out SteamOS on your device and providing feedback, you can use the SteamOS Recovery Image and follow the instructions here.
I think what they meant is you can test it on any device and provide feedback. [1]
[1] - https://help.steampowered.com/en/faqs/view/1B71-EDF2-EB6D-2B...
It's definitely not "officially supported" by Valve, but in many cases the hardware does have official OEM support in upstream Linux.
Until it does, I've had pretty good success with Bazzite (https://bazzite.gg/) on some hand-me-down hardware and hooked up to the TV.
> AMD hardware and an NVME drive, targeted toward handheld devices
So shelve your dreams of having SteamOS on an ARM handheld.
https://gitlab.steamos.cloud/steamrt/steamrt/-/commit/5833fa...
For now, the Steam client needs to be run inside an x86 emulator.