"Proto-Indo-Iranian language evolved out of an earlier stage in situ" is simply a translation of the fuzzy "Indigenous Aryans" into precise terms, based on straightforward meanings of "indigenous" and "Aryan". Now, you cannot simply sprinkle an article with  in random places and then cry "bad faith" when they are removed. Such behaviour is disruptive. I am sure we are more than happy to accept citation requests for specific claims, but we're not going to spell out and reference the meaning of English words like indigenous for your convenience. I invite you once again to contribute in a constructive way, but if you are unwilling or unable to do that, we have nothing to discuss here.  (𒁳)