> I said that search engines also hallucinate — my actual link gave several examples
They don't. Google added a weird widget that do hallucinate. But the result list is still accurate, even though it may be biased towards certain sources.
> You could tell where a search engine got an answer from, but not which answers were hidden
A bit pedantic, but a search engine returns a list of results according to the query you posted. There's no question-answer oracle. If you type "King of the United States", you will get pages that have the terms listed. Maybe there will be semantic manipulations like "King -> Head of state -> President", but generally it's on you to post the correct keywords.
They don't. Google added a weird widget that do hallucinate. But the result list is still accurate, even though it may be biased towards certain sources.
> You could tell where a search engine got an answer from, but not which answers were hidden
A bit pedantic, but a search engine returns a list of results according to the query you posted. There's no question-answer oracle. If you type "King of the United States", you will get pages that have the terms listed. Maybe there will be semantic manipulations like "King -> Head of state -> President", but generally it's on you to post the correct keywords.