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.
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.