I have a YouTube video that provides a summary of the case. Links to the video are automatically blocked on Facebook.
{video}
I watched the video. I don't recall it addressing the issue of how the racial differences arise.
For example, black people who live outside the first world (like everyone who lives outside the first world outside their own will) tend to live in poverty with incomplete access to education, healthcare, sanitation, and other things that promote intelligence. Black people who live within the first world tend to live with a history of oppression tied to their ankles - oppression that has only recently been getting taken down brick by brick.
These factors - historically and even presently poor living conditions with incomplete access to those things that promote intelligence - are as common to this group as their shared skin color.
Or to put it differently: I am already aware of, and accept, the evidence of the existence IQ differences between races; I am more interested in seeing the evidence showing these differences to be primarily the result of genetics rather than historical/environmental influences.
Causation vs. correlation.