Agreed, but the doctor in question is saying far more than that...he's saying it doesn't exist and it's ALL just a cabal.
You ignore the totally artificial enviroment of the elementary classroom. Boys are naturally more active than girls; they are taught by women who expect boys to behave like girls.
I assure you that I fully appreciate that. I'm also aware of the details of brain development that makes some people not able to learn in certain ways - such as by reading - at certain ages. The ban against any form of physical contact is problematic too. Boys especially tend to learn from tactile interaction and physical manipulation. I've met some young boys that don't seem to learn if someone is not touching them at the time (like a hand on the shoulder), or that don't seem to get things unless spanking is periodically involved - but are utterly unstressed by the spanking.
There are different ways of learning, and different ways of processing information. For example, some people process math visually, some audibly, some spatially/symbolically. Some few can switch between the methods at will.