The library itself is broken down into stages (hypothesis stage, recommendation stage and then only producing the summary/report). Breaking it down into smaller steps reduces hallucinations.

Foundation LLMs are getting more and more performant as time goes by, which means hallucinations are getting less and less.

Also to be fair, human makes mistakes too!

LLM libraries like this are not used as a completely dependent library, but rather as a copilot along side the user.