The note that was added made a big difference. There is no genetic basis implied, it's assessed on an environmental basis. The links do an excellent job at summarising some measures of IQ.

Another question is why raise the comment? This could imply a prejudice. While the reasoning wasn't clear, it made me think that Africa is a source of radicals unless its education standard can be lifted.

I have little faith in most sites being able to objectively discuss differences, but HN is still better than most. I encourage people to challenge prejudice in a consistent way (eg. No free tickets on being prejudiced based on gender or skin colour, unlike what happens at The Verge and most other media sites).