This is one of those questions that can't be usefully answered without reference to the experience it's asking about. I can say from my own experience that what's being described isn't nonsense, but I can't put words around it that make sense as an explanation of how I know. Nor can anyone else, as far as I can tell, and I've seen many try.

The method described here seems fine as far as it goes, but it's kind of like learning to ride a bike, or maybe how to juggle. There are clear steps you can follow, but they only take you up to the point where a moment of novel insight is required to grasp the skill, and only that moment of novel insight will take you any further. Once you've had it, you never forget it, but there's a step in there that no one else can take you through - you have to find it for yourself or not at all.

It's not fair, but that's just how it is as far as I can tell. I wish I could do better, and I'm sorry that I can't.