> That's what the parent is on about, if it requires new creativity not found by deriving from the learned corpus, then LLMs can't do it.

This is specious reasoning. If you look at each and every single realization attributed to "creativity", each and every single realization resulted from a source of inspiration where one or more traits were singled out to be remixed by the "creator". All ideas spawn from prior ideas and observations which are remixed. Even from analogues.