Ghost DNA

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https://www.dailymail.co.uk/sciencetech/article-7997861/New-study-shows-ghost-DNA-modern-day-population-west-Africa.html

In relation to black people, what is ghost DNA? Before you ask, no, I'm not a racist or an adherent of any /pol/-tier ideology. I'm just genuinely curious about this. And please.....leave politics out of this. This is not /pol/. Let's not have yet another thread devolve into a shitshow because retards want to propagate the culture war.

Is this legit or a just meme? Eurasians have remnants of Neanderthal and Denisovan DNA, so it's not like possessing the genetic material of archaic hominids is new.