Ahead of Legion Go S shipping, we will be shipping a beta of SteamOS which should improve the experience on other handhelds, and users can download and test this themselves.

So, neither that product is rolling out yet, nor the SteamOS beta is rolling out yet?

(This quote is from Valves announcement, but meaning-equivalent to the linked article sentence regarding it.)

[–] infeeeee@lemm.ee 10 points 1 day ago* (last edited 1 day ago)

"To the Wild" as to other manufacturers. Steamos is now available as a preinstallable option to hardware vendors. Since steam machines disappeared, steamos was only available to Valve devices. There were gossips that this will happen, this is the official announcement.