Maybe, but that sounds a little simplistic to me. People up to ~40 today hardly even remember apartheid. It's probably a factor, but I suspect there are other factors too.
It's not really addressed in the article, but the root problem seems to be the lack of a functioning democracy where those in power are held accountable at least to some degree.
Occam's razor is a rough heuristic, not a law of nature. Sometimes, the more complex explanation turns out to be the correct one.
Politics tends to be complex, and while I know next to nothing about South-African politics I have no reason to believe it's any different there. You can't just apply Occam's razor to the first simple explanation that springs to mind.
