There are a lot of things in the aviation world that seem weird to those who work in an environment where everything gets thrown away and rewritten every couple

There are a lot of things in the aviation world that seem weird to those who work in an environment where everything gets thrown away and rewritten every couple of years. Aviation infrastructure moves veeeeeerrrrry slowly. Heck, there are still DC-3s in commercial service (not just airshows or the like, but actual commercial service) and that plane is nearly 90 years old. I wouldn't be at all surprised if there were still small airports who get these notices on a printing teletype or something of that nature.