it is not the Varna branch if you are referring to E-Y182141, as far as I know there is no ancient DNA upstream to this branch.Isn't that the Varna branch? That would rather speak for a back migration with Sea Peoples or Greeks. By the way, the branch was formed 800 ybp, TMRCA 300 ybp, so this is just one family. I guess its from this paper on Egypt, where they intensively tested one region, and this seems to be a more recent founder event there.
But great to see that it was so successful in Egypt.
Interestingly it is as successful as it was a few years ago, when it had 0 samples, showing that you never really know when a new branch will appear.