Breh I think the dude is being clear when he says that while Africans may have traveled the continent, which is a no brainer, that isn't evidence that ancient Egyptian culture gave birth to west African culture. Everything we associate and identify ancient egypt with today is a product of dynastic egypt, which developed parallel to other ancient civs/cultures both inside and outside the African continent.
There is only one culture that we know of that developed parallel to the beginning of Dynastic Egypt/Old Kingdom. I don't know about "birthed" but there is clear cultural affinities between certain populations in East and West Africa going back to the Neolithic and further.
And it isn't a "may have traveled," its an immutable fact.