You can't prove humans do either. You can see how many times actual people with understanding something that's written for them. In many ways, you can actually prove that LLMs are superior to humans right now when it comes to understanding text.
Emphasis mine.
No, I don't think you can, without making "understanding" a term so broad as to be useless.
You can do this trick as well. Haven't you ever been to a class that you didn't really understand, but you can give correct answers?
I've had this somewhat unsettling experience several times. Someone asks you a question, words come out of your mouth, the other person accepts your answer.
But you don't know why.
Here's a question you probably know the answer to, but don't know why:
- I'm having steak. What type of red wine should I have?
I don't know shit about Malbec, I don't know where it's from, I don't know why it's good for steak, I don't know who makes it, how it's made.
But if I'm sitting at a restaurant and someone asks me about wine, I know the answer.