Having endless uninterrupted time surprisingly doesn’t help either. “I cant start because the weekend is in 4 days”.

Some of my most productive times have actually been sporadic bursts before appointments mainly for annoying tasks. The fact that you don’t have enough time seems to break the perfectionism blocker “I don’t have enough time so I’ll do a rush job of whatever I can knowing it will not be completed” and also avoids the self-disappointment pressure that would come from “I have plenty of time now but I still can’t work so I will never get it done”. It’s a time for building momentum. And it’s not like you are running away from the task purposely to procrastinate…it’s that you have no choice.

It’s like how some people are calm and productive when everything is in chaos, because the chaos makes it obvious exactly what needs to be done and no one is judging how it’s done they just need it resolved and you will be a hero.

This is just how the brain works. People who claim they can do a hard focused task in 20 min chunks are faking it. The article is trying to say I think "don't worry about that, because on average you will have some uninterrupted stretches in which to do the hard task, but right now get some simple shit done because that needs done too".