(Has the thread been Godwinned now?)
irregardless; Only from 1850 or so. Not originally.
Prior to that (and currently) it refers to the cultural self-designation of Indo-Iranians (about 2000BCE-ish), and still does. In this form, it has no racial meaning, just as 'American' has no racial meaning on it's own. It's a cultural self-designation.
A bit like the way the symbol for Buddha (The Japanese Manji character) was co-opted by the same central European political group in the early 20th century, yet is still heavily used.
https://maps.app.goo.gl/PTkJCwBCmNqtL1WA9 shows one example.
Mind you, some do have trouble with both of these, as they can't mentally detach the evil use for a couple of years from centuries and millennia of prior good use and hold them as two separate concepts. Both the self-designation word and the Manji character.