No, he isn't: he supposes that "any deviation from the standard" is called a disorder. That's false: we call something a disorder when it disrupts people's live

No, he isn't: he supposes that "any deviation from the standard" is called a disorder. That's false: we call something a disorder when it disrupts people's lives, not just when there's diversity. "Disorder" only applies when someone is bothered—and addressing the bother isn't "medicalization" any more than cleft palate repair or prescribing eyeglasses. He seems committed to using the term "disorder" about himself, even though he says he doesn't have one. But it's a problem of his own making: he could stop saying he has ADD and start saying he has an attention deficit.