The general consensus in that thread is that, while the Vision Pro can play “flat” porn videos on sites like PornHub, there is currently not an easy way to play 180 degree side-by-side videos on the Vision Pro, which is how most commercial VR porn is filmed.
I like to think is some obscure secret app from the Illuminati that tells you all the secrets…and strangely enough allows to play porn too but that is just a small feature on the side.