I just watched the documentary Searching for Sugar Man, a movie about Rodriguez. In this documentary they said that his music was a big influencer in fighting with music against the apartheid.
But when he did his first six concerts in South Africa, you can see parts of it in the documentary, there was (almost) not a single black one. And Wikipedia says that there are over 80% blacks (ethnic group).
So was his music only listened by the white population of South Africa or weren't they allowed to go to this concert in, I believe, '98? I doubt this, because apartheid was already ended at this time.