Creativity is a series of small decisions over the course of the entire execution. To write a poem is not to have it fully-formed in your head. You go down and edit and see what turns up and what new interesting ideas come out of that.
I suppose you could say such strokes of genius are the outcomes of a lifetime of creative work but that seems different from your example of editing a poem.
AI, as it stands, does not have a lifespan over which for creativity to occur.