Facts are gathered from structured reference data and encyclopedic sources, with every citation kept attached to the fact it came from.
A narration script is drafted from those facts only, never from open-ended invention, and each claim is tagged as verified history, local legend, or a mix.
A person reads the script against its sources and approves, revises, or rejects it. Nothing skips this step, and nothing plays until it passes.
Audio is produced once and cached, so every traveller hears the same approved recording rather than a fresh generation with fresh risks.