Interesting but it seems that CPU-Z just has a hard time to detect this stuff. Hwinfo has much better support. And thats the reason I wont add those as Core i9's. I also saw multiple CPU-Z pictures on the net showing different spec name with the usual ES CPU string but still with the Core i9 logo, which seems to be wrong. I guess its a CPU-Z bug which was likely (hopefully) fixed in newer versions.
And the problem seems to be this:
Family 6, Model 5, Ext Model 55 is the same for all CPUs
But stepping 2 just dont matches any production CPU (not even the ES samples of them).
Lowest number is 3 (and even those were obscure OEM stuff):
https://forums.servethehome.com/index.php?threads/es-xeon-discussion.5031/post-325960
So the CPUs you are showing here were some of the earliest Skylake-SP samples available. As long as nobody shows full spec for them with some current HWInfo and CPU-Z screens, I wont add them to the db.