I don't wanna sound like a PM but it's literally the top part of results which can be removed with adblock plus element blocker.
It's an entirely optional addon added by google.
It's not just that. It's also embedded into many of the other results now. I see it in the middle of stock ticker results, local places, etc.
And this is were the misconception appears. LLM's are a type of AI, but AI != LLM. The top part of the results, also called the AI summary. Is _not_ the only thing that is AI about search. Embeddings, a commonly used element of search, or ranking algorithms, use AI as well. More specifically, the techniques are known as machine learning, but it is AI. If you truly want to have no AI at all, then you are back to boolean retrieval systems. That basically boils down to: Count the amount of times the terms of your query appear in the document and return the top x results (which is impossible to do at Google's scale).