Bedrockgames
I post in the voice of Christopher Walken
It sounds as though you're saying his notes are there so y'all can change what's in them.
He is saying the note is just describing details in the world as a snapshot. Once you play begins everything is moving. One of the places where I first encountered this idea, though I know it existed prior, is Feast of Goblyns. I called this idea Living Adventure (they called it a wandering major encounter in FoG---but you can see how that leads to all kinds of other things if you explore it). This is one of the reasons it is a little frustrating to see these kinds of details described as playing to find out what is in the GMs notes. The GM might not even know what's in his notes once play starts and NPCs take on a life of their own: