From your own link: "TURKTRUST is the one and only local ECSP that its root certificates are recognized to Windows Programs by Microsoft."
Yes, but you don't have to be a domain registrar to be a CA. And in this case, TURKTRUST is just a CA, not a registrar.
Ocean: A body of water occupying about two-thirds of a world made for man -- who has no gills. -- Ambrose Bierce