I've actually studied hitler's pseudo-science at university level world history. nothing gave the professor and our whole class more laughs than mein kampf and the 'scientific publications' of his stooges. they actually considered slavs at a later point to be non-aryans worthy of being gassed along with jews (which they did), even though slavs, especially of poland, share much closer ethnicity and genetic make up with germans than any middle eastern people.
he even ended up assigning the 'aryan' tag to some balkan peoples simply because they were good at soccer (lmao!) or their dictators aligned militarily with the reich. similarly, iran's exemption from nurembourg was because they were allies in name, not for any genuine impression of them being 'aryans' (however innacurately interpreted the word was).
but just think about it, southern germans and polish people share almost exactly the same anthropological history and genetics, yet this austrian jew called hitler considered them an inferior race whilst iran (who by then had heavily mixed with arabs/turkic and other non indo-european groups) was pure? lmfao is all i can say.
his childish and laughable logic aside, the use of aryan was also a great disservice to the history and cultures of proto-indo-iranians. The remnants of any 'aryan culture' passed down can only be found amongst the zoroastrian peoples of khorasan, and some vedic descendants such as religious kashmiri pundits and other groups scattered through the himalayas. 'aryan' just meant a noble, highly esteemed person during the avestan/vedic period about four thousand years ago. it had nothing to do with 'race' or any other such modern machination.