iternabe I am wondering if this is true. For context, I am not thinking just being able to play that passage well in xx% of time, but to master it with such security and comfort that it's never going to be any problem.
I didn't have time to elaborate besides saying it's simplistic. Of the three R's she only gives two of them: effective (doesn't define that), and 'enough'. While talking she keeps slowly playing a few bars of the Ocean etude with the RH, and I hope that is not meant as a demo.
I did that etude last year. I used a lot of the (practising) ideas set out by Woroniki. It involved technique needed, different aspects of that technique, and also my own technical strengths and (lots of) weaknesses there. W has a number of videos, each showing a different thing, some almost seeming contradictory but they are not. You might play these as block chords, focusing on elbow motion. mirror image to what is written. There is one that focuses on the moment that thumb goes where the pinky was and vice versa, with a rotational motion. These are things to practise, and "repetitively" but that can mean a few times - then in a next session a few times - combine and test these things.
There's a lot more to it. My fear is that someone will watch this video and then try to "repeat enough times" and maybe as literally as the Ocean excerpt shows.
Personally, I hate the kinds of intros that say "Let's be honest" (first thing I hate), "you're not improving enough because..." -- latching onto fears - and the "because" .... has she watched the person(s) she is addressing to know the cause of difficulties. Is it even true that the person watching "isn't improving enough"? Maybe the person watching the video is doing too many repetitions. Maybe their teacher sees improvement and growth, and the student doesn't know what to look for.