Stating the T population is not of "Semitic" origin but as probable took a route via the Arabian peninsula to the Horn of Africa. As T is a minority lineage in the middle east it can't be certain that it came from there, there would be evidence for this as practically didn't inhabit all of the Arabian peninsula just a population that was in this case nomadic. Plus, the Ashkenazim barely have any T lineage at best it's a meager 3% as studies show.If it is confirmed to be of Arabian orgin as the evidence suggests, then it is a Semitic lineage as we share distant ancestry with Ashkenazi Jews. This lineage was probably part of ancient migration to the Levant/Northern Iraq like most Arabian T lineages and gradually spread through the Arabian peninsula.
It is illogical to argue that it could not be Semitic within the last few thousand years considering the ancient presence of haplogroup T in the Middle East.