Here is an example of what you call a rhetorical game:

***-- what I'm addressing is some of the other points
you and the raparazzi were making.
Did you know the Huns chased the Aryans into Europe? Did you know Hitler was
called "the Hun?"
Did you know genetic drift, recombinant DNA through mating, and emigration can cause
a big part of a gene sub-pool to shift out from under a pre-Mendel identity group?
I thought you did. ***

What you wrote there would help growth in any garden.

Now in your present post, its title, you address a real question, how did I know that the Aryans abolished books.

The answer is that I do not know. I was just quoting what the archaeologists were suggesting as a result of their radar study findings. According to them, Hindu scripture was an oral tradition after the Aryan invasion, but not before. I cannot remember the evidence they submitted for that conclusion. If you like I will look up the reference and give it to you.