The data is very clear that rising IQs in "black" demographics are overwhelmingly driven by mixed race children. Sure, you CAN have a 100% black woman with an IQ of 130 (3 standard deviations to the right hand tail), but it's an order of magnitude more likely that she's actually mixed race to your point so her median IQ would be expected to be in the high 90s. Making that a much more probable 2.25 standard deviations.
This is because dating preferences heavily favor IQ. Sure, et ceteris parabis people prefer to date someone of their own race, but nowhere nearly as strongly as they prefer "intelligent" and "not a felon".
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