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There may have been many things going on. This started in the late 1800′s, after the First Black Liberation. Blacks were living in segregation. Black males may have selected Black females with a progressive phenotype who they thought were more attractive. These females were probably also more intelligent for a reason I will relate below.
Black females may have selected Black males with progressive phenotypes for similar reasons. In addition, Black males with more progressive phenotypes were probably more intelligent, since progressive phenotypes are associated with increased IQ.
In addition, in segregation, lighter skilled Black males who looked more White would be more likely to “pass.” In segregated society, the Whiter looking Blacks in color or phenotype were more intelligent and were more likely to rise to the top of segregated Black society, which had plenty of doctors, lawyers and other professionals. Black females may have selected more successful Black males as mates.
All we can see is a selection on the part of either or both sexes of Blacks, for more progressive phenotype, which also no doubt had a higher IQ since the two things relate. Fist tap Big Don.