That is not what IQ is. It’s a very limited measurement of predicted success on our modern economy. There are other kinds of intelligence, which can be measured differently. And you can also note that this research could also be saying that, on some cases, race may lead to superior outcomes – for, say, Asians and Ashkenazi Jews. If all this were a white supremacist plot based on rigged pseudo-science, I would not expect Jews to come out on top, or for there to be no measurable difference in IQ between the two genders, or for Caucasian whites to be in the middle of the pack. And I wouldn’t expect it to earn a PhD at my alma mater.
Since this issue is so explosive and important, I look forward to the scholarly dismantling of the Richwine thesis. Have at it. I’ll happily publish the grotesque, racist errors that somehow got past Christopher Jencks.