The problem with discussing racial differences is that when people say “black”, they’re already making inherent assumptions about genetics. “Black” incorporates an incredible amount of genetic diversity, far more than the label “white”.
I don’t see why this is necessarily a problem. For example, if I observed that generally speaking, the South is warmer than Minnesota, I would be correct even though the South incorporates a lot more geographic diversity than Minnesota.
More usefully put, blacks are paraphyletic.
Of course, this hardly affects the extremely general point about IQ differences and ideology.