I have never heard that and doubt that it’s part of the local ordinances. It may be a way for your insurance company to attempt to get out of writing a policy up there. I know that many companies are trying to pull out.
Try checking with the Big Trees Village Property Owner’s Ass.
Has anyone else been told that they need to put rock around the entire perimeter of their cabin 6 feet out? Sounds both expensive and very ugly! Raking to bare ground that far out makes sense but rock? It was one of several requests made by the insurance company. Is this something new?