Even if we accept that (and I gave plenty of reasons above why IQ is deeply, deeply, flawed as a metric, and the link to race—both at all and in terms of amount—is deeply questionable, and just because there is some difference in early childhood doesn't mean all of what you claim is, so plenty of it could be later racism), you are still just arbitrarily saying that accounts for the disparity, when there is evidence that isn't the case, because tests have been done with matching candidates, or presenting the same applications with different photos, etc...