I am using Quest 3 and don't get same problems watching mentioned video as you. There are definitely still some problems.
After the 13.17 DeoVr update (april 2024) my Quest 3 also experiences crashes. This usually happens after 20 minutes of PT AI use. First picture vanish, then controllers stop working. Then it crashes. Notification says: There is not enough memory to run DeoVR. I just have to start DeoVR again. Not same problem as yours but suggests something is not right with AI PT in general.
PT mask works ok, girl is crisp and no background detectable. After 20 minutes of video I can see some out of sync. Not bad but you can see it. After 50 minutes out of sync is horrible. It is even worse than the trouble SLR had week ago: https://forum.sexlikereal.com/d/8260-ai-pt-mask-out-of-sync
I have never seen this kind of video. It starts ok, but the out of sync increases by the minute and at the end of the video it is worst I have ever seen. Really weird??