I don't think this is a violation of 406.4(D). The stainless steel cover complies. There is no possibility of debris or other objects being allowed into the box, due to a gap between the receptacle and the cover plate.
Just because the accessory plate gives the receptacle a recessed appearance, doesn't mean that the receptacle doesn't project from it's cover plate.
It looks to me as though the cord can be removed easily enough with a lift and a counter-clockwise motion.
Edit to add:
Seems practical, but is it going to meet 110.2?
If it's UL listed, then the AHJ doesn't have much to stand on. Using 110.2 as a last-ditch citation is pretty flimsy, IMO.
[This message has been edited by The_Judge (edited 05-28-2005).]