Being snarkily dismissive of mental disorders isn't a great look, especially when OP stated that they also went to therapy for anxiety/depression and also stated they work less now than they did before because they're able to properly focus.
But the comment was probably meant to highlight that there's a sense of ambiguity in medicating what's likely a natural individual difference in brain chemistry. Many diagnosed with ADHD would be considered perfectly well-functioning in a society where hunting, defense or other stressful, spontaneous physically and psychologically demanding activities were common. Many of them would excel at it far beyond the ideal office worker.
So in that sense it can be considered a critique of contemporary society's requirements and standards.
I tried for a decade to make myself work "naturally". Almost left to be a monastic forever. At some point you have to pick up the same shovel everyone else is holding.
Unless you want to pay me 100k to keep trying to do my own thing.
First, I doubt there is any historical evidence of such a phenomenon.
Second, ADHD isn't nearly as prevalent enough in the general population to suggest that it's society.
If you have ADHD, doing what OP is doing is not going to be easy untreated.