A world model can be used to learn something about the real system. I said synthesize because in the context that LLM's work in (using a corpus to generate sentences) that is what that would look like.
But that small semantic note aside, if an LLM is used to trigger other tools to find new facts, then those other tools are modeling the "world" or a particular domain. Alternatively you could say that the system as a whole, that the LLM is a part of, models the "world" or a particular domain.
