Then I think you should check in with your favorite mental health provider before you become a danger to yourself or others.

Simply put LLMs do understand some things within their crystalized intelligence. Your anthropocentric mind may not accept this, but one day it will. As LLMs have a very short context window in relation to their stored knowledge they have very limited plastic intelligence to change their minds or adapt. All of which is flushed away at the end of a session. It would be like living without the ability to turn your short term memory into new long term memories.

I would gladly use another word for what LLMs can do, but the world at large has not adopted any. The definitions we use around intelligence, comprehension, understanding, consciousness, and sapitence have already been failing us for some time before LLMs as our scientific understanding of biology has increased over the decades as it is. I am one for more exacting definitions when they exist, but humans seem to barely understand the inner workings of our own minds, in large such words escape us.