Not arguing Frank, as Sir Terrance who was at the conference will tell you,Tazi,Afghan,sloughi etc are just regional variations of the saluki type adapted to whatever game and terrain their running
E.G In his article in Gail Goodmans "saluki coursing hound of the east" he discovered on his travels in the middle east the king of morroco and the saudi,s regularly eaxchange hounds
He goes on to display various pictures of different hounds from Turckey(tazi),Morroco(sloughi),africa(Awzaki) and you cant tell the difference