A little premature to be calling such a prediction "silly". I think it's safe to assume some sort of LLM-based tech will be part of the most successful search engines within a relatively short period of time (a year tops). And if Google dallies its market share will definitely suffer.
Do you think Google's search engine can do that now?
Actually ChatGPT does appear to have the ability to distinguish the two, the big problem it has is presenting made-up information as though it were factual.