I, too, hate to be this guy, but:
Here was the original claim (in the title of the YouTube video):
Africans have never built a major enduring city in 3,000 years.
By the normal rules of English construction, this claim means that, during the last 3,000 years (i.e. since roughly 982 B.C.E.), black people haven't built any major enduring cities. It does not mean that black people haven't built cities that have endured for more than 3,000 years. That is, the time period in question is not before 3,000 years ago, but within the last 3,000 years.
To show the claim false, we need to find cities that meet all of the following criteria:
1. Built in the last 3000 years
2. By black people
3. Counts as a "major" city (which is up to judgment)
4. And has "endured" (where, presumably, again it's up to judgment and comparison with other old cities as to what counts for endurance).
The ones I listed do meet those criteria. I suppose someone could take issue with the ones in India, but both of those were founded by the dark-skinned Southern Indians of Dravidian descent, and their skin is as dark as that of anyone from Africa.
Anyway, of course I agree about your further observation that the claim wouldn't mean much, even if true.