I don't think it's fair to dismiss the OIT hypothesis as a Hindu nationalist thing. I wrote some more about it in a comment on this article, but it actually just seems like the most likely explanation given the evidence.
Arguing the archeology, genetics, and (grudgingly, it's barely a science) linguistics is totally fair but I'd like to see more open-minded debate on the data.
The Mitanni (1500 BCE) and the Tarim Basin mummies partially Indian DNA are important points to address, but the Sarasvati river dating has to force a dramatic re-think of how Indo-European languages spread.
Arguing the archeology, genetics, and (grudgingly, it's barely a science) linguistics is totally fair but I'd like to see more open-minded debate on the data.
The Mitanni (1500 BCE) and the Tarim Basin mummies partially Indian DNA are important points to address, but the Sarasvati river dating has to force a dramatic re-think of how Indo-European languages spread.