It's far more likely that these are Hackintoshes. Apple will never sell the Mac Pro with an i9, and those chips are not compatible with the existing Mac Pro anyway.
Maybe You see Macstorm Ultra geekbench result . No MacPro works with i9 13th Gen CPU due to not compatible motherboard . Macstorm Ultra with Intel i7-13900F far ahead any M1 Mac Studio Ultra 😀 Better for real performance is Cinebench R23.
Xeon is a wide class of processors. Up until Gen 12 Intel was regularly doing a Xeon version of the mainstream processor. Just a matter of turning features on/off on the die. For example
" ...Code Name Products formerly Rocket Lake ...
...
Intel® Xeon® W-1370P Processor (16M Cache, up to 5.20 GHz) quick reference with specifications, features, and technologies.
ark.intel.com
It isn't about Xeon or not. It is about the designated workstation class CPU package (e.g., Xeon E5 , W-2xxx , W-3xxx ). If stuck with Intel likely not backsliding on PCI-e lane count from the CPU package . (e.g., Gen 13 i9 is 20 lanes. Where the MP 2019 is carrying 64).
Pretty good chance Apple silicon will backslide on lane provisioning, but if were going to stick with Intel and wanted to minimize main logic board changes from the MP 2019 , it would be something else with a better lane count match.
Intel is struggling to just get Gen 12/13 out the door with the subset they are committed to so the W-1xxxx is dragging.