Proton compatibility depends on the game build, anti-cheat configuration and launcher behavior. A community report that one test starts under Proton is not a durable support promise. [steam]

Windows and anti-cheat are the current baseline

  1. Treat Windows as the only supported launch operating system.

  2. Check the Steam Deck compatibility badge after release.

  3. Wait for an official anti-cheat and Proton statement before relying on Linux access.

Signals that would change the answer

No native Linux build, supported Proton version or Steam Deck rating is published on the official store page. [steam]