Smiddy
I don't think IQ has anything to do with knowing truth from lie. As you mention in your post Galliano discovered that the earth was not the centre of the universe. Yes prior to his discovery this was believed as truth, fact, but galliano's truth became fact. Never was the previous teaching labelled as a lie . but nor was it announced as newlight!
Only the WTBTS coin the saying old truth and new truth. They play with words and blur fact from fiction... lie from truth. they are conditioned to believe lying doesnt exist in their doctrine.
You dont need a high IQ to differiente between fact and fiction, lies and truth, unless of course your blinded by the cunning wording the society uses to dumb their masses.