In principle, from an engineering perspective, one critiques the body of work of others where one is in the field, and could offer discernible research material of h(er)is own to prove, or otherwise disprove ideas, or concepts in others' works. If no, then it becomes non sequiter.
Nevertheless, simply going by my travels from S. Egypt, Sudan, Morocco, Mauritania, Ethiopia, to Somalia, I could say with confidence, but with no anthropological, or scientific evidence, as these are not my fields of study, peoples in these regions share more than just geography, ergo the interest.
If this is your field of study, even if a hobby, then do share so others could peruse, but if it is just a mere hunch, then [...] .
If most likely Cushites, pastoral, and similar to Somalis, could not her conclusion be sound instead of writing it off as a mere coincidence?
Nonetheless, let us see what other qualified SME think, and further discuss the validity of her conclusions.