https://www.geneticsandsociety.org/article/study-africans-mo...
https://blogs.bcm.edu/2018/07/19/genetic-diversity-in-africa...
there are "Larger Genetic Differences Within Africans Than Between Africans and Eurasians" "and the genetic diversity in Eurasians is largely a subset of that in Africans, supporting the out of Africa model of human evolution"
https://www.genetics.org/content/161/1/269
The highest genetic diversity is actually among people who are small subgroups of "Africans" - Khoisan not Bantu.
https://www.nature.com/articles/ncomms6692
https://www.newscientist.com/article/dn24988-humanitys-forgo...
https://pubmed.ncbi.nlm.nih.gov/25471224/
So, genetically, just as you can't draw a line around "bony fishes" without also including land animals who are also descendants of bony fishes.
https://www.sciencealert.com/actually-there-is-no-such-thing...
Also, you can't genetically call "Africans" a well-defined sub-group of humans, excluding others.