Test-makers map raw scores to deviation IQs so that the IQs are normally distributed. So I think a statement that IQs are normally distributed is mostly a statement about how IQs are computed.

Originally, IQ stood for intelligence quotient -- the ratio of mental age to chronological age. I wonder how closely the distribution of ratio IQs conforms to the normal distribution.

"To see what is in front of one's nose needs a constant struggle." - George Orwell