Probably, but can we be sure? We know the keeper already had both feet off the line before the ball was struck (otherwise VAR would not have required a retake) so the argument apparently being used by the IFAB here is that such movement is potentially what caused the player to miss. Now admittedly, in this particular case I'm not convinced that the movement was early enough and noticeable enough for the kicker to have been influenced by it into altering her kicking motion.
However if you're going to start saying that even with the newly relaxed permission that allows the keeper extra leeway to take one full step off the line, you're still not going to penalise it until it's truly, truly blatant then we'd just be going back to exactly where we were before. Allowing the same old practices that always used to be applied to goalkeepers coming off the line before the change, is obviously not what the IFAB had in mind when they made the change.
So long as they stick to this in future, I think (as I said earlier) that keepers should be able to adjust to this relatively easily. The way to do it is to concentrate on lateral rather than forwards movement, which might arguably even improve their chances of making a save, assuming they've chosen the right direction. If they've gone the wrong way, it's not going to make any difference, of course but that was always true.