As I understood, they will roll this out through "Google Play Services" and not the Android OS. So, any device with Google Play Services will be affected.
You can read more here: https://github.com/keepandroidopen/keepandroidopen.github.io/blob/main/src/content/pages/en/index.md
I see. Valve's Android virtualisation is called "Lepton" and it's a fork of Waydroid.
I wonder where they're going with this. I know Valve is a game platform. From that I suspect that they will use Lepton to bypass the Google Play ecosystem and have their own Android Lepton Play store.
But wouldn't it just be Android games on Linux, and not other apps?