Not fixed at all. It still has horrible artifacting (vertical pixels or lines move when there is movement). Its also still fully using my 4070 ti super. Playing 8k videos in heresphere doesnt even get close to maxing out my GPU. Like 30% or so for 90fps on quest 3 resolution.
The one thing i will mention though is when it was fully unplayable with total pixelation i didnt realize i had h.264 selected. When i switched to h.265 the complete pixelation went away, but it still artifacts and maxes out my GPU.
I seriously dont understand why you are so hesitant to explain to us why you cant figure out that this problem started as soon as the early december update. This is so obvious that is the cause, whatever was changed in that update. Just roll it back sheesh. Thats the first thing to try.
PS: It is still unusable using quest air link (which i prefer for certain things), only virtual desktop makes it work a little bit better.