That is not what Western science claims. You seem to be describing a garbled version of some junk pseudo history that the Nazis spouted decades ago but that is not at all representative of any reputable modern science
While we literally have attestations in government letters (in almost every century prior to 20th), local literature and population awareness of the continuity of the freaking name of the country but somehow they completely ignore it.
They also frequently use the word "Aryan" as a derogatory/fake term for Iranians and say "why you don't look like white Europeans if you claim to be Aryan".
[1]: https://www.les-crises.fr/l-origine-nazie-du-nom-de-liran-un...
Also nobody other than Nazis calls the Aryans "European";
The origin of the Indo-European language family tree is from the Pontic-Caspian steppe region; what is today southeastern Ukraine and southern Russia, roughly from the Dniepro to the Volga. The "Aryans" (really multiple names and multiple peoples) were people who moved eastwards from there, carrying early Indo-Iranian languages with them. (Over a 1000+ year history, winding their way eastwards across central Asia, so I'm not sure how you could spin that as "European")
The Bhagavad Gita is quite clear about the cultures of the old Aryan peoples. They were nomadic, cowherding peoples, who were highly patriarchal, that valued prowess in battle and the ability to kill your enemies ruthlessly, even if they were members of your own family. They were probably white because Tocharian speakers in western China are depicted in cave painting as having blond hair and blue eyes[0], a group of people who completely split off the rest of the Indo-European tribal peoples well before they entered the subcontinent.
Is Nazi race science as a justification for brutal genocide and the destruction of labor organizing something I agree with? No, but the Nazis understood that anyone can spin a story to justify any political regime, and that whoever is in power is constantly inventing their own histories to justify their power. None of these things are very meaningful, in the end. Language, culture, and history is far more diverse than the question of Yamnaya genetics.
[0]https://en.wikipedia.org/wiki/Tocharian_languages#/media/Fil...
Not this again. This is an old missionaries tale. There are descriptions of large cities and palaces in Mahabharata (of which Gita is part). Nomads don't construct palaces and large cities. Also, the Gita is about duty to preserve good not killing. (A few months ago I debunked a similar comment on this site lol)
A somewhat similar process likely happened in the settling of Europe the Yamnaya culture passed through, integrated with, displaced, or dominated the Cucuteni–Trypillia culture and other settled agriculture societies in the Danube & Balkans regions.
Likely by the time early Indic speakers came to dominate in the subcontinent they were at least in part a non-pastoral culture, maybe with the typical Indo-European tri-partite class system with warrior-priest-farmer, but all proto-Indo-Aryan speaking.
> Bhagavad Gita is a short read, you can read and find there are no mentions of nomadic lifestyles in that.
Which was written between 5th century BCE to the 2nd century BCE? So at least 1000 years Indo-European migrations. How is that relevant?