That’s still steamos2, based on debian 8 (current is debian 12). What’s on the Steam deck is much more recent, usable and stable.
There’s some user made distros that are basically just like steamos3 though, but at that point you may just as well install a mainstream linux distribution and simply install steam on it.
https://store.steampowered.com/steamos/buildyourown
You can install it yourself on PC.
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That’s still steamos2, based on debian 8 (current is debian 12). What’s on the Steam deck is much more recent, usable and stable.
There’s some user made distros that are basically just like steamos3 though, but at that point you may just as well install a mainstream linux distribution and simply install steam on it.