607 is true if you assume the bible is true and inspired
607 is true if it is found in history books. Remember, there are no dates in the bible at all, so we rely on secular history for those. I assume that secular history is true, and that the bible (which isn't an invention of Jehovah's Witnesses Inc) if it were correct, would not contradict scholarly history.
607 is true only if you blindly follow the Governing Body without verifying anything outside of a Watchtower.