More than semantics
Thank you JohnH. I was worried that in the worst case, you were going to rearrange the sequence!
I will certainly agree that plant before release is WAY too early. I'll add that it is also too early if turn initiation feels similar to the way people grab the newel post at the bottom of the stairs during a descent and swing themselves around it -- that's body rotation. There is a place for that stuff, but it's not usually needed. The newel post analogy is a bit of an exagerration, but the concept of a fixed point that the whole body rotates about is not... and that is to be avoided.
It's for sure too late if your already on the new edges.
I am compelled to clear up my opinion, because it's not just how it feels to me:
CSIA level III/IV instructors have told me in conversation (some without seeing me ski, so not all comments were specifically tailored to fix my problems) that the pole touch is timed to occur the moment the skis actually ARE flat.
They also said that the poles are in the process of being planted as the skiis are flattening. That indicates the whole process begins before flat. ( I'd suggest the whole process begins at release, and ends with touch down at neutral. )
There is no jarring, as the pole is removed by your outstretched arm (still forwards) as you ski by -- hand is certainly infront of hips... There is no need to linger and keep the pole stuck in the slope. ( Which will "jar" you regardless of timing).
It also matters quite a lot as to where the pole is actually planted. If it's far enough ahead and downhill, then the process can actually help you flatten the skis! Great on steeper slopes.
(This weekend, I will begin swinging my basket forward at the exact moment I release the CM, and parallel to the direction of the released CM.)
I hope I didn't open a huge can of worms, but that's my story and I'm sticking to it!
Added afterthought: Are you actually saying that the pole touch actually happens just before flat, the skis go flat, and the poles are removed just after having gone flat?