N. The whole point of CDA is to avoid any level flight with power on. The quote you have brought up must not be for CDA approaches! There is no point or advantage in level flight before intercepting final descent- you will be at about 2500 feet with high power on, flaps out, possibly gear down. What have you achieved? The idea of CDA is to steadily descend as required so as not to fly level with power on creating noise and unnecessarily pitching the cabin. All it takes is the pilot assessing his altitude and distance to touchdown and managing a steady descent. It is not hard!
Giles- CDA only applies in the lower stages of the approach- I can't remember if it's 7000' or below Transition Level. It is not practical higher up with so many height constraints.