Hello-- I'm a physicist at NCSU and can tell you without doubt that this discussion is based on a hoax.

India tested nuclear weapons in the area described, which along with accidents etc. can explain an area of high radioactivity. A weapons blast thousands of years ago would be extremely difficult if not impossible to detect above background. The infrastructure required for nuclear weapons construction could not be missed (mines, for example, which are permanent). I have familiarity with nuclear weapon design and it is a very sophisticated area requiring precision machining, materials processing, and many areas of development that were just barely possible in the 1940's. It couldn't be done in the 1930's, much less 3000 BC!
The translated texts would not be quoted in those forms before WWII.

Prabhupad was hopelessly misinformed about scientific subjects; in the above quote, for example, he says "The atomic energy works wholly on total combustibility," which I'm afraid is meaningless; combustion is a chemical reaction, not nuclear, and the nuclear reaction is far from "total" in any sense of the word. He said many things that are beyond his training or exposure. Best to realize his limitations and find out for yourself from people and sources that are expert and accurate about scientific matters.