Correct, the Cessna wing washout starts outboard of the strut, and the twist in the last bit of aileron span does the rest. The wing cam adjustment changes the angle of incidence of the whole wing though. Depending upon which way to turn the cam(s) (there is a dot to show), the rear spar is moved a tiny bit outboard or inboard, along with up or down as intended. It's a good system. I've set up other types which did not have wing angle of incidence adjustment per wing, and you have to fiddle a flight control instead.