The clear problem here is that the research implies that IQ is inate. It is not. IQs vary at different points in your life, and can be boosted by various factors including education, proper nutrition (or the lack thereof), cultural factors, and indeed, being schooled on how to do well at an IQ test.
IQ is a rough and ready test for intellect, and even then is a pretty poor basis from which to draw conclusions about racial superiority.
That isnt to say the conclusion is incorrect necessarily, just that the evidence is less than convincing.