Because the Nazis never used the term 'Aryan' in that sense. Besides that area has been mixed with so many different people so many times it is unlikely there is anything truly Aryan left.
What gives or any white person the monopoly on 'Aryan'? I doubt you have a single cultural root in your body to those people that lived in central asia.
The people the greatest rights to make use of the term are people from Iran, northern India and even irrelevant nations like Tajikwhatsit. And if I'm not mistaken, Aryan is still actually a first name for boys in India. Hindus have also been making use of the swastika for the longest time.
It's almost no different than black people taking credit for the pyramids.
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