The title is arguably inaccurate, as Oculus have repeatedly stated that these are Oculus Store exclusives, not Rift hardware exclusives, eg [1].
Since the Rift is the only PC headset currently supported by the Oculus Store, that's a bit of a technical distinction. But it does imply that they shouldn't have a big problem with this sort of compatibility layer existing, though they're unlikely to support it directly for obvious QA reasons. After all, you still have to buy the games from them!
According to github, it seems that the VR stuff is codesigned, so to use the compat layer, you have to patch out the verification of code signatures, meaning that it is indeed tied to specific hardware in the code of each application
Since the Rift is the only PC headset currently supported by the Oculus Store, that's a bit of a technical distinction. But it does imply that they shouldn't have a big problem with this sort of compatibility layer existing, though they're unlikely to support it directly for obvious QA reasons. After all, you still have to buy the games from them!
[1] https://www.reddit.com/r/pcmasterrace/comments/40ea0x/i_am_p...