So the Dir - Isaaq connection has not been confirmed yet. Epic trolling.
Not really. It is just that we have one y-full test to work with, which is useless when determining the TMRCA of the Y16897 subclade that they belong to.
In his post, all Esteban states is that the Garxajis and the Djiboutians are closely related and belong to Y16897 as one of them has tested positive for it.
Have a look at the Djiboutian STR's and the FTDNA ones, you will find that some of them are closer to each other than they are to mine. Hence, one should look at it on a subclan basis. Nonetheless, we cannot definitely conclude anything from this as they are not y-full tests or even the relatively reliable 111 STR marker test.
All in all, knowing what subclade that we mostly belong to is a good start, but we need other volunteers to estimate the TMRCA of our Y16897 subclade.