This is super broken.
There’s an entire property missing that needs to be defined in order for it to work. I had to edit the JSON via SQL to get this example working: Kinetic UI Utility - Favorite Menu Items Reorder - Experts’ Corner - Epicor User Help Forum
I had opened a case, but they were dumb and frustrating and I gave up and let it close from inactivity because I don’t have the time or crayons.