I found this using google: https://www.scirp.org/journal/PaperInformation.aspx?paperID=19566

It makes the case that there is a lack of genes from black sub-sahara africans in other races.

Same can be found in this article: https://wakeup-world.com/2013/12/16/dna-evidence-debunks-the-out-of-africa-theory-of-human-evolution/

This makes the case that if black people reached Australia and Australia was cut off then they should be very african in their DNA, but they are not.

Keep in mind that the "out of Africa theory" was politically motivated and even then Professors Alan C. Wilson and Rebecca L. Cann who are most important in pushing for this theory said it was probably from Africa. As far as I can tell the theory itself was made of 2 parts, one that everyone shares some common female ancestor (not very convincing) and that the oldest remains at the time were in Africa, it was a good theory at the time but no more then a most likely type of scenario then actually proving anything.

Later this argument lost meaning because even older remains were found in Europe and the genetic study was not conclusive.

The theory was not necessarily disproven, as in it did not prove that humans did not originate in Africa, as much as the arguments for it have been disproven and the genetic evidence makes it highly unlikely.