Stuk, A. Creed had visual artifacts when running in DX10.1 mode, from lights bleeding through walls to an entire rendering pass missing that included dust particles and other issues... ATi didn't want to invest in helping get it up to snuff, and what interest did NVidia have in doing the work, considering they had nothing to gain in spending the money to make the code work.

It's a case of AMD/ATi refused to put up or shut up, so they pushed the blame on NVidia instead.