It's just loud gangster rap. I don't think it's hate speech and I don't agree with music censorship at all (although I think we'd be doing the world a favour if we banned Steve Hofmeyer). I do love Richard Poplak's writing in general. He is particularly entertaining in this Daily Maverick post.
It's not the first song that I am aware of that speaks about farm workers moering their baases. Check out Ou Kleine Jannie by Mr Mac and the Genuines. A fantastic song