The dispute concerns the causal origins of the so-called "IQ gap". The fact of the "IQ gap" isn't itself in dispute (or if it is, it is a different dispute than the one Yvain refers to).

Nothing in my post was directed at the grandparent. It was direct at Johnicholas comment:

Is race a sharp, rigid concept, suitable for building theory-structures with?

If he doesn't think race is a rigid enough concept for coming up with theories, surely he wouldn't mind betting against someone who used it explicitly to make predictions? If it helped people make predictions that were more accurate than his own, how could he maintain the claim that they are too fuzzy for inclusion in theories?