Give me a break, your finances, chances at failing in education, getting fired at work, are much higher with ADHD. Enough of the anti-medication nonsense.
Not serious or reputable? He lives with the brain difference! He's been on various medications, had to deal with countless evaluations, and learned many coping mechanisms. If it's a binary choice, I'll take his lecture any day over someone who studies the data but has no firsthand experience. (Fortunately, few decisions in life are purely binary.)
If you figure out what part of the extended phenotype your daughter has the deficits you can probably move forward, however I've never seen this explained anywhere else other than his book. I wish more people had read it.