This is the exact type of propaganda "papers" without any evidence that the colonial types produce.
There is no distinction between the "aryan invaders" and the native harrappan peoples: https://www.theweek.in/news/india/2019/09/06/new-study-debun...
Sure, some tribes may have migrated. But these tribes were not the "white civilizers" of the "dark natives" as the European colonizers wanted to promote.
Too bad much of Indology is still persisting with the direction set by the English and Germans in the late 1800s.
