I'm impressed that he has the ... whatever, to share his experience. But I often wonder where people get the confidence to go from "I've written my first draft" to "I'm entitled to give advice on how others should write". It seems a pretty big leap to me.
I have my own (private) writing log*, and there are parts that feel very familiar what what Matt Gemmell says in his article, but at other points we diverge significantly. Things like not accepting pauses of more than a minute. I don't work like that. I've always been dogged (though others have called it other things

), and I tend to see things through. That's not going to work for everyone, it doesn't always work for me, but walking away from it (for me) is asking to be distracted and never getting past it.
There is something contradictory in human nature. We seem to have both the "it worked for me so it must work for you" reaction to things, and we hold it right next to the one that says "my experience was so different to what anyone else has ever had". It's not always obvious which one will jump to the fore in a given situation.
* It is one of my many procrastination activities. Though, to be honest, I think the log helps me to get some things out of the way, out of my system, so that time in the story doesn't get sidelined by other thoughts.