The unpopular truth is that Blacks score lower than whites on I.Q. tests. Another unpopular truth is that whites score lower than Asians and Jews. What he said that REALLY got him in trouble is that, in his opinion, because Blacks score lower on I.Q. tests they were incapable of rising from the corruption and poverty and plagues modern day Africa.
It wasn’t so much pointing out that they score lower, it was the implication that this lower score was due to genetics (unfounded, and he admits it), and the direct statement that BECAUSE of this difference there was really ‘no hope for Africa’.