This discussion is confusing to me. We already have benchmarks from the XSX CPU on PC in the form of the 4800S Desktop Kit and it performs roughly where we would expect.
"Ultimately we end with one or two surprises in our gaming tests - and a disappointment with Metro Exodus - but for the most part, an Xbox Series X CPU in PC form tends to deliver the same class of performance as it does on the Xbox Series X running on its own streamlined version of Windows. Just remember, we do have the advantage of no memory contention with the GPU, an extra core plus 11 percent of core clock. It may be time to put a bit more time into delivering absolute console parity in terms of settings with a few more PC titles, as this could be interesting for further testing - not just with this board but in our GPU reviews too."
What if you transplant the CPU from the Xbox Series X into a Windows gaming PC? AMD’s 4800S Desktop Kit allows just that - and we've tested it extensively!
www.eurogamer.net
The titles that struggle to hit 60 FPS due to CPU limitations (eg. Starfied, BG3, Dragon's Dogma 2) also don't hit 60 FPS on PC Zen 2 parts. So I don't see where the mystery is.