I like the story, however this is sensationalist science reporting and not really what the research says.
People in that region of the world share a complex DNA imprint with European, Asian, and Middle Eastern populations, resulting in a mixed ancestry that persists to this day.
Yes you can find a trace of a tribe in the modern European population, you can also find traces of tribes from other places.
Autosomal DNA only goes back a few generations (about 200 years) at which point nobody for sure can tell who your parents were. Mitochondrial DNA can tell to some extent your matrilineal ancestry for a bit over 1000 years. 8000 years ago, forget about it, the amount of DNA you inherit (or do not) is so small beyond a few dozen generations you cannot distinguish except for large region provided they were isolated from each other not too long ago.
So yes, we did inherit some DNA which travelled around the world but you cannot distinguish ancestry with any accuracy, it is equally likely an aboriginal tribe from Australia or a shark species has a similar genetic mutation that means nothing in the grand scheme of your DNA.
Whether anyone specifically inherited that mutation or whether this is even the same mutation is also impossible to say. It is entirely possible that over the years we have lost and then re-evolved that specific sequence, that’s how small the sample is.
From a research perspective, I would give this a “interesting enough to support your PhD thesis”, not “hypothesis proven”