The seat bottoms fold forward. The seat backs fold down over the batteries. So when you fold the seat bottom forward into the foot wells, you will see the battery case before you fold the seat backs over the batteries. The picture is of the seat bottoms folded into the foot wells before the seat backs are folded down.Looks to me from what you are posted that the seats fold forward to allow access to the batteries. The seat back hinges still appear to be up off the ground so it seams they wouldn't lay flat flush with the rear cargo area.
Again this is all speculation.