Well, maybe I'm reading it too conservative.
[....] If the nonnumeric display does not permit the fight crew to readily distinguish excessive vertical deviations, the approach must be conducted with the flight director and/or the autopilot and a numeric display should allow the pilot to readily distinguish if the vertical deviation exceeds ±75 feet
I read it as a FD/AP with a mode selected that follows the path, e.g. VNAV, but it is strictly read not specified.