Does this prove the existence of the Aryans?

If they were only as old as history, we'd know who they were. Anyhow, the "Aryans" notion is Nazi race-science hokum.

These people are possibly a Greek genetic residue from Alexander's campaigns.

No . . . although it does prove how easy it is to sucker people with a confirmation bias, especially those who indulge in racist bigotry.

The Aryans were a real people they were not invented by the NAZIs. They lived on the steppes long before the Germans ever reached northern Europe. They invaded south Asia a couple thousand years before Christ and I don’t think they were the first invaders from the steppes. But I don’t think any of them had blond hair and blue eyes. It would seem that if they ever had those characteristic they would be more visible in the current population of the region. The NAZIs were good at distorting facts to fit their propaganda.