That's what Watson and others were saying though, is that the differences might be important when you're dealing with population and nation level policy making. If it were true, it could have implications for Africa's development and the policies the West should apply when dealing with African nations, or how African leaders should act in regard to their own people.My argument here is thus similar to Zimmerman's claims: that differences likely exist, and may be relevant across populations, but in most cases race is probably too weakly predictive (versus other accessible variables) to be relevant in individual cases.
I agree with you of course that race can never be used to evaluate an individuals ability.