There are forms of poetry/art/etc. that we've never thought of, that have never been conceived before. An LLM being what it is won't conceive these. Humans will

There are forms of poetry/art/etc. that we've never thought of, that have never been conceived before. An LLM being what it is won't conceive these. Humans will continue to generate language the pattern/structure/meaning of which has never been generated by LLMs before. Thought experiment to prove this: if you trained an LLM on every utterance of human language before the 5th century BC would you get any idea we would recognize as modern?