In other words, the article leaves aside the possibility that you might have ADHD, which is present in an estimated 7% of people in a clinically significant way, and likely far more to a degree that wouldn’t satisfy the DSM, but is still a handicap.
Anxiety will do it too. So will hypervigilance, which presents with ADHD like symptoms but arises from trauma.
My procrastination dropped a lot once I medically intervened on ADHD, Anxiety, and Depression. I wonder where I'd be now if I had taken these steps 20 years ago.
20 years ago, the science was a lot less conclusive on ADHD. The drugs were far less sophisticated as well. Today, the condition is highly treatable (90%) with medication.