Yes indeed. AMD's hardware is not as good at processing NV's propriety Gameworks code.
At LEAST it can run it at all, unlike GPU PhysX. I guess NV realized locking out AMD on such a feature hurts them when all the reviewers compare with PhysX OFF... now Gameworks is allowed to run on AMD hardware, but crippled, just to make the comparisons possible by reviewers.
I'm sure you were just as quick to
point out how inferior NV hardware was when CoH used Dx11 compute for rendering & physics calculation, or early on in AMD GE games with global illumination via DX11 or even just a few days ago in Dragon Age Inq benchmarked showing the R290X pwning the 980 and the 780ti harder... wait... You didn't.