A child may not understand South Africa has tens of millions of people who look the same with the same skin colour but are part of multiple different tribes, cultures, languages, beliefs, goals etc. Almost as if they’re not a monolith because they share a skin colour, weird huh.

All of these words but none of it disproves that the guy went to South Africa, and got a feeling for [technically not all of] the blacks told him. You would have worded it differently, perhaps naming each tribe. Such as the biggest black tribe which genocided the native black tribe of South Africa. But this guy was a tourist so he didn't know all that.