I joined a growing team in South Africa as the only black in ~40; and a foreigner to boot. When I left 3 years later we were only 2 out of 120. In the years that I was there, I probably participated in about 100+ interviews. In that whole time, I never got a single black South African interviewee. Not even for an internship! To be clear, I had phone screens with folks from Egypt, Pakistan, UK, Nigeria etc. I think the black community in South Africa is in a wedge.
My 2 cents: Systemic issues probably cause them to rarely progress to white collar jobs. The kids in the education system don't see any benefit in progressing to higher education because, they don't know anyone in their family/neighborhood who made it. Compound it with schools that have gangs in them [1] and an easy choice appears. 1. Slog through education with probably no chance of a good job (from a young person's view point) or 2. Join this gang, make money, drive fast cars and belong.