Comparison is not metaphor. Ironically metaphor is actually something LLMs are somewhat adept at picking up on provided there's enough training data saying there's a metaphor there, for a seminal work.
Whatever you may wish to call it, simile or metaphor, it's a little silly to complain about it being referred to as a metaphor, considering that similes are a subset of metaphor, even if they often aren't taught this way to children. Also, in common speech and literature, what would be taught as similes to children are almost universally just referred to as metaphors.
