Depends on how far back you want to go I guess because North East Africa has been a melting point for thousands of years. Nonetheless, our presence in Africa is thought to be the result of an in-migration. My probable subclade (Y16897) and those of many Dirs (including T haplogroup Isaaqs) is estimated to have a TMRCA of 7200ybp. It is unlikely that Eastern European Ashkenazi Jews and Arabs that share this subclade are the result of an out-migration from Africa.The Antemoro descend from Arabs who may or may not have stopped off in Somalia. Name Abu Bakr's clan if you think he was a Samaale. If he was, everybody would be claiming him.
Haplogroup T is a can of worms that has not yet been fully worked out. As Anonimo pointed out, they are not Cushitic, are not E1b1b.
Actually, it is highly likely that Somali haplogroup T Dirs might be the result of a recent founder effect that occurred within the last two millenniums, but not after the start of the High Middle Ages.Anonimo is holding out for a founder effect at an early date, but, as your quote notes, it looks like the T's are the result of recent migrations. T originates in the upper Mediterranean basin to the Zagros mountains in Iran. One theory is that the Dir originate from a population that migrated into the Red Sea hills during the Neolithic, which also fits into the Ifat format. A real answer is going to take some additional DNA work.
We ain't descended from a Middle Eastern or South Asian man that settled in the Horn 700 or so years ago and sowed his oats with willing Cushitic beauties, that much I am sure of.