Taleb's whole shtick is claiming that most things are a "pseudoscientific swindle". His background is in trading, and he tends to distrust all predictive models (hence his "Black Swan"). I think it's true that IQ does not tell the whole story when it comes to intelligence and life success. It's very hard to predict things based on IQ alone. But then, it's very hard to predict things about a person based on anything alone.

Taleb's required standard of rigor would immediately discredit the entirety of psychology and the vast majority of social science in general. While I think most of it probably should be discredited, my standard of evidence is not nearly as high as Taleb; furthermore, my "null hypothesis" is NOT assuming that all groups are the same, so the fact that the evidence is less certain doesn't make me any more likely to accept the equalitarian hypothesis.