Exaggeration is not falsehood
Common hyperboles in a conversation are not falsehood. For example after relating a certain thing one says:
“I have told you a hundred times!” Obviously, he has not repeated his statement a hundred times and it is also clear that by “hundred” he does not imply the figure “100”; but rather it means that he has said it a number of times.
Similarly other figures of speech are also permitted, especially in poetry.