LLMs act nothing like our brains and are not neural networks

Err, yes they are. You don't even need to read a paper on the subject, just go straight to the Wikipedia page and it's right there in the first line. The 'T' in GPT is literally Transformer, you're highly unlikely to find a Transformer model that doesn't use an ANN at its core.

Please don't turn this place into Reddit by spreading misinformation.