Still that MT score is nothing to write home about. 6950X can easily do 4.3GHz.
So now we are taking ES CPU on who knows what memory setup as gospel of MT scaling on Skylake-X. It's less than count of cores, once scaled properly it is gonna be just fine.
Again, the important take away is that in CPU-Z ST bench 4.4Ghz Skylake-X equals 5Ghz Skylake-X. That is pretty much upper bound of IPC improvement.
Btw I did not bother to reply to that nice pessimization of performance estimates. 10% better with +-7% error in my book means it could be also >15% faster.