Autistic people were the original LLMs. I don't care how much data you shove into it, there is still no LLM on Earth that knows more about trains than an autistic guy who knows everything about trains.

The difference is the autistic person isn't completely sycophantic and might be completely disgusted that you don't know the first production date of the C40-8W.

Using a larger vocabulary doesn't make you sound like an llm, it's more about the tone.