SteamOS is Valve’s Linux-based operating system. It features a seamless user experience optimized for gaming, while retaining access to the power and flexibility of a PC, and plays tens of thousands of games on Steam. SteamOS officially ships on Steam Deck, and will soon ship with certain Legion Go S models. We’re currently working on adding support for more devices.
Its talking about the newer SteamOS 3.0
No the guys is right, at first the title did only mention SteamOS, that’s why!
SteamOS 3.0 was released March 2022, so more than 3 years ago.