I did not see the program, but have read some about this. I am sure there is over-diagnosis; however, I also do believe it is a real issue in cases, and I wonder if high intelligence "masks" ADHD diagnosis as well as the cases you have mentioned about people confusing high intelligence/multitask ability with ADHD.
For instance, what about a kid who can do his school work, ace his tests, such that his teachers would not even think there's an issue and wouldn't refer him. However, at home he is inefficient/unfocussed (homework that should take 20 minutes takes 2 hrs or longer and several episodes of redirection), completely disconnected to his body such that he breaks everything in his path, sometimes disproportionately angry/violent, etc. Some clear ADHD issues that could be "helped" by medication. Is it really so sinful to help him get along, be socially acceptable/likeable, score substantially higher scores on tests, etc. Doesn't every parent want their kid to have it easier?
As I get older and forget more, need to make lists, I think that if there was a medication that helped improve my "functioning" I'd at least try it. I don't understand why there is such a stigma with medicines when they're supposed to be developed to help people.