This isn't saying that __ALL__ procrastination is ADHD, and the other article didn't say that __ALL__ procrastination is emotional. This article is saying that this specific person's procrastination is linked to their ADHD - and even covers some of the emotional response portion (the section on feedback dysphoria).
Most psychologists and psychiatrists worth their salt will tell you that ADHD and Anxiety are kissing-cousins; and will usually look for the other if someone has one of them. Guess what is a great emotional inhibitor to doing things... Anxiety.
More generally, a strong emotional response of any kind could be considered as a chemical imbalance by how you're categorizing ADHD. ADHD isn't as hard and fast assigned a "chemical imbalance" like Depression, and more closely related to Asperger/Autism as an executive function/communication disorder (via DSM 4r9 and all of DSM 5). The reason that some of us are given something like Welbutrin or Proponolol instead of a straight stimulant like Ritalin or Aderall is because ADHD can in many cases be clustered with Depression, Anxiety, or other mood disorders (which are in the "chemical imbalance" group, and knocking out one can help the other).
So, short story long, there's no contradiction; but like with most things, there can be multiple root causes for a single, broadly defined outcome like procrastination.
Most psychologists and psychiatrists worth their salt will tell you that ADHD and Anxiety are kissing-cousins; and will usually look for the other if someone has one of them. Guess what is a great emotional inhibitor to doing things... Anxiety.
More generally, a strong emotional response of any kind could be considered as a chemical imbalance by how you're categorizing ADHD. ADHD isn't as hard and fast assigned a "chemical imbalance" like Depression, and more closely related to Asperger/Autism as an executive function/communication disorder (via DSM 4r9 and all of DSM 5). The reason that some of us are given something like Welbutrin or Proponolol instead of a straight stimulant like Ritalin or Aderall is because ADHD can in many cases be clustered with Depression, Anxiety, or other mood disorders (which are in the "chemical imbalance" group, and knocking out one can help the other).
So, short story long, there's no contradiction; but like with most things, there can be multiple root causes for a single, broadly defined outcome like procrastination.