Absolutely correct Dick!
More importantly I doubt that the Cessna 400 auto pilot would have any capability for vertical guidance.
Sadly we possibly have a case here where the pilot did a great job in flight planning, plenty of fuel. Ticked the box for takeoff and landing weights. Viewing the photograph of the aircraft instrument panel, some nice equipment has been installed, let down only by a minimal auto pilot, which was probably great in its heyday; I doubt if it would really have the ability to 0.1nm tracking tolerance in gusty conditions.
For a Cessna 404 it was a low time aircraft by today's standards; I've seen Titan's knocking on the door of 50,000 hours.