Sounds like a good thing in general, although the install folder is not the issue as far as vorpX is concerned. Since vorpX normally doesn’t have to install any files to game folders, it already can hook many (probably most) Game Pass games, doesn’t matter if they are installed in the write protected app folders or not.
The problematic ones are games compiled as UWP/Windows Store app, which basically put the executable in some sandbox that shields them from the rest of the system. Luckily the whole UWP model is halfway dead, wasn’t the huge success among developers MS hoped it would be. So with some luck less new releases will use it in the future. Unlikely though that all current UWP games will be converted back to ‘normal’ Windows applications.