Subsaharan Africans have mated with for now unknown hominin cca 30kya. As for your claim, you're mostly right. There was an incursion of non-African DNA into S

Subsaharan Africans have mated with for now unknown hominin cca 30kya. As for your claim, you're mostly right. There was an incursion of non-African DNA into Subsaharan Africa around 3000kya, probably related to Bronze Age Collapse and migrations around it. Because of this, Africans can carry up to 25% Eurasian DNA, and part of that is Neandertal. https://www.bbc.com/news/science-environment-34479905 https://www.bbc.com/news/science-environment-34479905