You are right it does indeed say Cat III. But you can definitely be trained and flying a Cat IIIB aircraft, and still be Cat IIIA limited. Incidentally the rollout feature takes a bit of getting used to. The first time I actually tried it I instinctively tried to put the aircraft back on the centreline. It was tracking straight but a little offset. The aircraft fights you if you try and correct it. Obviously the solution is to disconnect the autopilot...learning by doing!