As a Christian I find that unfathomable (I don’t believe God created them differently in terms of IQ), and as someone who has met sharp blacks from Africa I don’t see it. My town growing up had plenty of whites with the same pathologies, and today more than ever I see young whites with the same issues.
It is the average. Of course there is variation with some high IQ blacks. Americans are afraid of a biological basis of intelligence as it directly threatens their basic false belief that we are all equal. We are equal before the law(a now dubious assumption with “equal opportunity” and diversity.)