Ok so this was a statement only made in the 7th edition to be clear not stated in earlier editions....
No, Whip, that wording goes all the way back to the first edition (1969). What is different in the 7th is that the final two sentences of the 6th were cut -- one going all the way back to the first edition -- and replaced with the following truncation:
"Delayed Hip Action is the only Variation that assures 'Clearing of the Right Hip' in both directions (2-N-0). So Hip Action is delayed until Start Down."
Note that Homer Kelley has underlined the word 'Action'. In TGM, Motion and Action are different animals. Just because something moves doesn't mean it is causing anything to happen. Action, on the other hand, means that work is actually being done. And what Homer is telling us here is that, in the Delayed Hip Turn, the Action (work) of the Hip Turn doesn't begin until Start Down (when it Pulls the Shoulders down). In Standard Action, the Hip Turn's work begins in Start Up (when it Pulls the Shoulders back).
This is why the Hip Turn (Component #14) and Hip Action (Component #15) are differentiated. It is not enough to simply classify the movement. You must also classify the work.