That particular tutorial is a bit out dated, but it gets the idea down. We didn’t like the way we initially setup the waypoint patrol node in 2.0 so it got changed at some point after that.
Here’s the general layout you would want to make a successful patrol. The values I’m filling out should correspond to the options you have in the behavior tree nodes.
behavior tree root
waypoint patrol (waypoint route: "Waypoint Route", move target variable: waypointTarget)
move (move target: waypointTarget)
So this would be just a waypoint patrol node, with a move node as its child. Let me know if you have questions.