I think alot of it has to do with water change over to fall temps throughout the lake.
I have always believed that there is a population of walleyes in that lake that relate to weedline forage base throughout the summer.They are just difficult to present a lure or bait to.The system seems to be divided during the summer.
As the water cools I think you have more of the lakes population moving to those shallow areas looking for the forage base that has moved from the deep basin areas into the shallow cool water. IMHO
I’m not a guide but I did stay at a holiday inn last night.