Well yeah, it's a bit low (considering the pretty aggressive ram timings/speed), but IMO still nothing too surprising.
From
the very same review site, Pairing a 1080Ti with a 7700K @ 4.8Ghz gets 174 FPS running at 1080p. About the same FPS as
a R7 1600 @ 3.2 GHz running at 720p. We can't really deduce much more until he actually runs benchmarks @ 720p.
My 1700X with a 1070 GTX and memory @ 3466CL16 got between 110-120 FPS in the same single player scene (approximately so, from memory, can test it in the evening).
EDIT:
The
GamersNexus review of 8700K also has a 1080ti. Now obviously even that is apples and oranges, but the 2700X results don't look half that bad (rather I'd say a significant improvement over 1st gen)