looks like the mod works fine.
the reason it "appears" not to work is that this mod detects chunks the demolisher has visited in order to get a rough idea of what their territory is, this brand new testing world doesn't yet have any demolishers that finished patrolling their territory once.
you can see this for yourself with the /demolisher-compass command, it'll add an overlay that shows how often a demolisher has been in certain chunks.
