Their 48 core Centriq 2400 is listed at $2000. The 28 core Skylake they compare it to is $10000. They claim 4x better performance per dollar, which puts it at the chip level as 0.8x as fast as the Intel. That would peg every core as 0.5x as fast as the Intel.
It won't win a single-thread contest, but that puts it well within the "very fast" category.