Yeah, but you're a white supremacist. So it's easy to determine to what you would attribute any differences. If for no reason other than because you brought the point up in a discussion about eugenics.
However, from the same link:
Today, the scientific consensus is that genetics does not explain differences in IQ test performance between groups, and that observed differences are environmental in origin.
Since you didn't point out any IQ differences to environmental factors, I can only assume that you were implying genetics...given that you raised the point to begin with in an exchange about eugenics. Which puts you squarely in the camp of those circa 1920s eugenics lobbyists. See how that works?