Interesting how propagandists twist history to take virtually 'everything' away from a benevolent empire that controlled the world for hundreds of years - the Persians.
Now even Zoroaster was not Persian, but Turkmen?
I suppose it's reasonable to say that the Persian religion came from Central Asia, since the Persians themselves likely came from that direction.
As another poster has said, though, the writer is also in need of more grant money, thus the spectacular announcement.
There's no such thing as a benevolent empire. It's also not surprising that the ancestors of the Persians came from elsewhere. That's the case with everyone's ancestors.