To give a quick example vis-a-vis LLM's: I can reason and understand well enough without having to be 'trained' on near the entire corpus of human literary. LLM's of course do not reason or understand and their output is determined by human input. That alone indicates our minds work differently to LLM's.
I wonder how ChatGPT would fair if it were trained on birdsong and then asked for a rhyming couplet?