This reads like a strategy for creating filler content. If you have to write a school essay an outline helps you churn through all the BS. By contrast, when you try to write something meaningful almost all effort goes into two things (a) figuring out what you actually have to say and (b) finding the right words to express it. School essays are written by people who don't have anything to say. Intro fluff. Chapter one fluff. Conclusion fluff. It's not real writing. You can speedrun it because no thinking is involved.
The same applies to fluff software, but only to fluff software. If you have to create a page with a dozen buttons with a bunch of click handlers, hook those up to basic AJAX calls, then yes, you can speedrun that as well. Because it's extremely easy work that involves no thinking.
Many things in life are kind of mundane and tedious. Fake school work, taxes, cleaning, ironing, to give just a few examples. And having strategies to blast through that kind of work effectively is useful. But these strategies absolutely unhelpful when you're trying to do anything creative or difficult.
You can't write a great spy novel with an outline like: 'introduce spy character', 'successful mission 1 in present time', 'flash back to failed earlier mission', 'introduction of big bad guy', 'flash back to tragic backstory', 'spy gets assigned special mission only his handler knows about'. Filling out an outline like this produces an uninspired, boring, formulaic trash. You end up with bad airport reading, the equivalent of AI slop.
To give another example: PG spends MONTHS on a single essay. He is not bottlenecked by a missing outline. Speedrunning the wiring process doesn't help. Figuring out exactly what you want to say is the hard part. Putting words on paper is trivial in comparison.