If you're not talking about how the brain works in a way that isn't a normal functioning, then you're saying it somehow has nothing to do with medical science or biology. That doesn't make sense because it would mean it's not a physical condition when it is.
Welcome to psychology, lol. Biology *cannot* explain behavioral phenomena, because as a species we are living in enormous, complex, fictitious social organizations; "neurodivergence" is an empty attempt to explain why some aren't "behaving right" in a particular social setting.
You're basically saying that psychology discounts medical science and physical tangible reality. That doesn't sound right.
Not what I'm saying! Psychology, or more specifically, psychoanalysis, is where subjectivity itself is the object of study. Subjectivity cannot be reduced to biology. It's the intersection of nature v nurture; neither are the sole cause of anything, subjectivity erupts from their collision.