Abraham Lincoln - African American ancestry?

[Steve]

A few days ago I got a random YouTube video recommendation which led to this video from the same channel. This video is just a recording of a talk given at a confrence in Nov. 2024 by forensic genealogist Colleen Fitzpatrick about the possibility of using DNA to solve a 1971 air piracy/hijacking case. I know, it doesn't really have anything to do with this Forum. But in the openning minutes of her talk she give a brief overview of previous historical cases she's worked on. One of them involved testing the DNA of Abraham Lincoln and his relatives. She seems to say that Lincoln had some African American ancestry:

https://www.youtube.com/watch?v=5WrpAZi3AuI

(relevant section begins at 2:41 point)

The whole video is about 40 minutes long but this section is only a couple of minutes long.

Does anyone have any idea what she's talking about?

Steve Whitlock was involved in the Genetic Lincoln group, but sadly he's passed and I can't ask him him about this. Here's a link to her Wikipedia page, so she's not a crank peddling the Abraham Enloe nonsense:

https://en.wikipedia.org/wiki/Colleen_M._Fitzpatrick

Abraham Lincoln has one of the more mysterious family trees of any of the presidents - his maternal grandfather is unknown and his paternal grandmother (Thomas Lincoln's mother) is only known by her first name, Bathsheba, without a known maiden name or family. (Some people have claimed that her maiden last name was Herring, but as of yet, there's no evidence for that.) That's 50% unknown ancestry with a potential for surprises. But I've never heard of any DNA test finding African ancestry.