I wouldn't call this random comment reliable testimony that they are sponsoring FEX.
They took their sweet time but both the project lead Ryan Houdek as well as Valve developer Pierre-Loup Griffais (username Plagman here in the comments) have now come out saying that FEX-Emu was not just sponsored by Valve but is actually their project and that they approached suitable developers with the idea who they have been paying for the development: https://www.gamingonlinux.com/2025/12/valve-have-been-fundin...
I see what you did there.