You're right to call that out, that's a fair point. "Fully understands" is indeed a bit of an overstatement for the current state of AI.

What I meant from a technical perspective is that the system uses a Retrieval-Augmented Generation (RAG) approach. It has the entire book's content available in a vector database, and when you ask a question, it performs a semantic search to pull the most relevant passages in real-time to use as context for the LLM's answer.

So, from a user's perspective, the experience is designed to feel like you're conversing with an expert who can instantly recall any part of the book. I should have used more precise language. Thanks for keeping me honest!