Well you can say that but then their language is a mixture of Greek and Sanskrit, They still believe in the ancient Greek gods such as Zeus and Apollo but particularly Di Zau (Zeus's brother), their carvings are ripe with Macedonian symbology, the name 'Kalash' itself is the ancient Greek name for lapis lazuli (a gem which is found abundantly there), their burying rituals are that of ancient greece, They them selves believe and tell legends of their descent for the Greek armies of Alexander and Dionysus and then theres the way they look; light skin, blond hair and blue eyes:
Micheal Wood has written all about this in his book "In The Footsteps of Alexander The Great". You can check the following link to a forum for some extracts from this book:
Kalash people admitt:ancient Macedonians were Greek
An article from The Guardian:
Nikos Deja Vu - The Kalash People a lost Greek tribe struggles for survival