Yes it is surprising that though they inhabit an area very close to mongoloid people they have managed to preserve their genetic heritage over the millennia which is remarkable, I was actually expecting them to have mongoloid influence though less than the regualr tajiks of tajikistan, their genetic results have indeed surprised me a lot.
Never the less the pamiri tajiks culture is totally different than that of pashtuns of afghanistan despite the two groups having same ancient east-iranic linguistic and genetic heritage. Pamiri tajiks of badakhshan prefer persian/dari language over their ancient east iranic dialects. Pamiri tajiks are culturally far more closer to people of chitral, hunza and gilgit in northern pakistan than they are to pashtuns or other afghani groups.
Those who don't know who pamiri tajiks of afghanistan are or how they look like can have an idea of them from the following music videos from badakhshan and ishkisham area of north east afghanistan. The music artists and singers in the following videos are all from badakhshan Pamir afghanistan.
After modern genetic findings the importance of historical and mythological origins has greatly decreased because genetics is science and exactly tells you who is who and with whom is he related to not only at this point in time but also ancient relationship with other populations. So the genetics has debunked the theory of ghilzais having anything to do with turkic people of central asia, I will take genetics on history or mythology books on any day.