Relevant bit:

But look fundamentally, this is something that comes with comedy you know, you’ve got to learn what comedy is. If you don’t study your art form you are prone to make mistakes in that world. For too long in South Africa comedy was such a small thing that people didn’t understand the fundamentals: what it is and how it runs. Nobody owns comedy, nobody owns a premise, nobody owns an idea. Comedy is your personal take on a thing. Do you get what I’m saying? Like half the jokes young black comedians are doing in America right now, Richard Pryor and Eddie Murphy were doing 20 years ago. Chris Rock says it himself; he says: “When I started comedy I was basically a fake Eddie Murphy/Richard Pryor.” Everything has been done before, there’s nothing new under the sun and in South African comedy there was a small group of guys, it was basically the Pure Monate Show guys, they were the forerunners of comedy. They were the guys who set this thing up. They’re the guys who made it popular to be honest. Everyone had their little niche thing and they fitted perfectly. So one guy was doing the coloured jokes and one guy was doing the political stuff and one guy was doing the cerebral stuff and one guy was doing the American stuff, but now when the market gets filled up with more comedians, you don’t own that thing anymore. This is what all the guys just didn’t understand; they were like: “No, that’s mine! I’m the guy who tells the jokes about the government!” And we’re like, no everyone tells jokes about government. David Kau, he even wrote on his DVD: “I was the first person to do a Nelson Mandela impression.” Like no you weren’t. There was a great comedian named Billy Prince who died as an unknown, and he was arguably one of the best comedians this country has ever produced. The best impressions, the best comedy, he was phenomenal. And he was doing these things long before anyone. They always say know your history and then you’ll know your present better and that’s really all it is..

That's not exactly a denial.