Because it's a search box, not a question box, and there's no way it's retrained each time somebody posts a review, thus is worse than a database query (arguably, because this is HN).
It explicitly is a question box, and it doesn't need to be "retrained" every time someone posts a review, they're most likely being embedded, summarized, and put into a vector database that the question box can RAG.
This is close to a textbook example of where an LLM is useful. It's interesting seeing just how knee-jerk-y some people's irrational hatred of this has become.
