Earlier quoted context omitted.
I don't find it now, but I've read that anecdote is made up. And I don't think it make sense. Except for when you are an absolute beginner, you won't improve if you don't put in any effort in the quality of your work. See deliberate practice etc..
I think you are missing the forest for the trees. The point is to get over that mental hurdle of achieving perfection, which blocks a lot of people from getting started.
It's an appealing idea because it's counterintuitive, and here on HN were are absolute suckers for contrarian ways to outsmart the herd. But we have been given no reason to think it actually works.