One important thing to know about people like these is that they don't have a rational argument
They have a Believe and they like to shout it out to the world.
Oh, I'm absolutely aware of that, I was just curious if there was literally anything they could point to that could, if viewed at through significantly rose-colored lenses, be seen as support for their statement. Like maybe (given my previous experience with Hindu nationalists) some passage in the Vedas that was interpreted to mean ancient Hindus were actually a spacefaring race or something.