The guy must have been stoned at the time. Otherwise, it is hard to explain this:
The greatest of them is the African Union whose goal for a half-century has been to erase the borders between us that were drawn in distant imperial capitals.
First, nobody---and that includes Africans---ever thinks of the AU as "great" or even "good". Second, nobody has the slightest interest, beyond hot air, in erasing those borders. Nor has there been any attempt, which perhaps explains why it remains a "goal for a half-century". Indeed, all sorts of funny visa regulations make it difficult for an African to even travel to other countries in Africa.
And the rest of his speech included more "serious and earnest" jokes of that calibre.