The bigger models avoid those mistakes by being, well, bigger. Offloading to a structured knowledgebase would achieve the same without the model needing to be bigger. Indeed, the model could be a lot smaller (and a lot less resource-intensive) if it only needed to worry about converting $LANGUAGE queries to Lisp queries and converting Lisp results back into $LANGUAGE results (where $LANGUAGE is the user's natural language, whatever that might be), rather than having to store some approximation of that knowledgebase within itself on top of understanding $LANGUAGE and understanding whatever ad-hoc query/result language it's unconsciously invented for itself.