I think cacs are forgetting that small numbers of africans actually did live in ancient europe.
They didn't have the transatlantic slave trade back then, but slavery in smaller numbers still did exist. Plus there were a small number traveling african merchants. Immigration isn't some new Phenomena that was invented by Christopher columbus.
People mad about the black samurai in assassin creed despite him being a real person. and records suggest there were small number (100s) of africans living in feudal era of japan.