As far as I'm aware, the color profiles are nowhere mentioned on the SLR website. So you would have to download and analyze each video file to find out, which is impracticable. Moreover, you probably stream AV1 files while you can only download the HEVC versions, so there is no way to verify the color profile of the AV1 files you might watch.
All VR porn video files that I am able to check mention BT.709 (= Rec 709) in their metadata, incl. SLRO and VRSpy. WankzVR files metadata do not include any color profile information. But as the guy in the other post said, current videos are most likely all SDR and thus Rec 709.