Sadly psychiatric conditions like ADHD remain quite stigmatised. I assume keyle wouldn't speak so derisively of someone suggesting to speak to a medical professional about a list of physical symptoms.
The internet is making everyone productivity addicts, can't just live anymore and be different.
If the author does not bring ADHD in the conversation, I think it's rude to find him a condition on the back of his post, which is far more interesting than isolating a paragraph and pulling a diagnosis on him.
It's a great blog post.
On this part in particular while it can be great to deeply follow your passion with extreme focus; pursuing things regardless of their importance in your overall life and at the cost of other interests, relationships, or responsibilities can be an empty and unfulfilling existence in the end. Furthermore life can be markedly better with the correct interventions and treatment.
People seemingly get offended by even a suggestion because many people have extreme stigma against conditions like ADHD as well as a lot of misinformation from people have very little understanding of the actual traits, diagnostic criteria, treatment and prevalence of it.