Not the way I understand it, it doesn't. My reading of the explanation is that it says the old practice of touching the ball so that it did not clearly move and then pretending that it had not been taken, was unsporting - and so that now the ball must 'clearly move' in order to be in play. If it clearly moves then (at least in the IFAB's eyes as I understand it) it is not unsporting any more because everyone is supposed to know that it has moved and is in play.
The current law says, "The ball is in play when it is kicked and clearly moves; it does not need to leave the corner area." If a corner kick is taken that falls within those parameters I don't see why it wouldn't be allowed. As I mentioned, I think there's a difference between what the IFAB says used to happen and was unsporting and the new wording which if fully complied with, is surely legal.
Now, I think it's still an unsatisfactory form of wording leading to conflicting interpretations (as the length of this current discussion amply demonstrates) and an easy way round it is to say the ball must leave corner area to be in play. I would estimate that over 99% of corner kicks leave the corner area anyway (based on the frequency with which this 'trick play corner' occurs in most major leagues) and so making that the official position would simply confirm what happens in the overwhelming majority of cases anyway. It would inconvenience almost nobody (hardly anyone uses this trick play) and would eliminate the whole debate and confusion that we're having right now.
I don't understand the argument that it wouldn't change anything. Once the ball has clearly moved and is fully outside the corner area, it's obvious - no matter where it starts from. Whereas now, the ball can clearly move but if it remains inside the corner area, people are still unsure as to the exact situation.