I was wrong! Checked again and the other wire from the ufer goes to the water. Panel in the house has no GEC, and the ufer/water GEC only goes to the main, located at the detached garage. And, the garage does not have a rod, just a wire dangling out of the panel where it used to be...
Goes to show, when you think something is messed up, look again, it might be worse than you thought!
