Comment by adrianN

As far as I know phrenology measured all kinds of things and claimed correlations. But they used highly dubious data (even for their time) and the field is now too unpopular to try (something similar) again with better methodology.

And I would say that the racist claim is that there is observable correlation and that genetic explanations are about as probable as other explanations. But I suppose many non-genetic explanations (eg cultural differences) would also be counted as racism, since in these kinds of discussions race and culture are often jumbled together.