> these conditions

You are assuming these are real biological things in an individual, and not normal reactions to flaws in society/environment.

I've spent a decade trying to write in silico brains to simulate some of these conditions. I couldn't figure out how to map the DSM to reality. When I became open to the possibility that the DSM really is a weapon to be used against behaviors some people don't like, things started to make more sense.

You are also assuming these are purely linked to environment/society. Some DSM symptoms are likely based on environment and coping mechanisms developed. I do think that current lifestyle makes ADHD worse, but there hasn't been any research which shows it's purely due to society.

ADHD has been observed across the world in different lifestyles and societies - rich and poor, different parenting styles, now and when computers weren't a thing. It doesn't seem to purely be related to environment/society.

We don't understand a lot about brain, yet to definitively say ADHD is not biological. I don't really know how you mimicked chemical imbalances in silico brain, but just because you couldn't simulate them doesn't prove it's not biological.