GPL and the Oculus SDK

[AnyOldName3]

I'm dealing with a guy on the OpenMW forums who's complaining that we've been hiding behind the Occulus SDK and OpenVR aren't GPL-compatible, so we're waiting for OpenXR excuse for not starting work on VR, claiming that it's a lie started by Dolphin devs to silence someone with the wrong political opinions. I want to avoid saying anything incorrect, so can I get the actual story? I'm under the impression that (at least some of) the devs were vaguely aware of a licence-breaking fork for a while, but ignored it because it looked interesting until someone bothered to complain.