^I agree with that, and furthermore Leonidis and Peterson's reads on black IQs is pretty misguided IMO. I think Peterson is just pandering to his audience here, whites who view HB/IQs as the end all be all, in the same mold of Candace Owen and other boomercon black pundits.
Consider that the IQs of whites have been dropping precipitously in the West, which is pretty clear when you consider the decline in the ability of younger people to read and write and do maths. The dumbing down through the deliberate sabotage of the educational system has been very well documented by the likes of Charlotte Iserbyt.
The fact that blacks might yield slightly fewer genuises per capita is irrelevant, they can as a whole aspire to a suitable career in pretty much the same range of options as whites, provided they have decent educational opportunities as well as enough disciplin, family support, and real pride in their culture the way African immigrants have. Peterson is not doing them a favor here with the latter element.
IQ is almost completely genetic. Diet and early education might have some influence on it, but it would be very limited.
The reason white IQ's in the west are dropping is the same issue with all the other races in the west. The dumbest and weakest are paid by the govt. to have more kids (welfare) while the intelligent and hard working are punished for having kids (taxes, expenses) and thus they are having less children.
IQ isn't the end all, but when IQ's drop below 90 it starts to very much limit what someone can do. Reading, comprehension and logical thought processes will be inferior enough that any critical thinking work is pretty much out the window. These types used to do manual labor and could have pride in their work. Much of this has been replaced by machines.