A few specific quibbles:
The article says it's not a "disorder", but a "disorder" in psychiatry-speak means "Any pattern of psychological or behavioral symptoms that causes an individual significant distress, impairs their ability to function in life, and/or significantly increases their risk of death, pain, disability, or loss of freedom." ADHD symptoms may not represent a disorder for every individual in every situation. It's fine to say "change the environment" but that's not always an option.
Not to mention the "hunter-gatherer vs farmer" dichotomy doesn't explain the rise of ADHD diagnoses in the last 20 years mostly in the US vs other western countries, which are just as rich and just as regimented.
The other issue I have is with Thom Hartmann's description of ADHD which focuses on distractability and hyperactivity, but those are just two of the most common of the many symptoms that make up ADHD.
Finally, the woman apparently is familiar with abusing Adderall herself. Speaking as someone who has ADHD and benefits from Adderall, I don't experience it as "crack". Nor have I found it remotely addictive. Certainly it's less addictive than caffeine.
The general points are fine (schools and workplaces in the US have issues of their own that encourage ADHD-like symptoms), but the details are wildly wrong.