This result should only be surprising to white people who are racist and believe black people have never been capable of anything other than being slaves. Every ancient source that interacted with the Ancient Egyptians described them as a people with black skin and wooly hair. And they constantly compared them to the people of Ancient Ethiopia.
Considering the diversity of black people in Africa, I'm not surprised that many in Ancient Egypt were ancestors of many West Africans just like some where ancestors for East Africans.
Egyptians were not West and East Africans ancestors