I have two kids in K12 and I don’t think it’s that simple. Not that I have a good explanation of my own, mind you.
Is this explanation not making a blatant assumption here that girls are statistically less hyperactive and distracted than boys?
I haven’t really seen a good argument for what changed. I guess it’s possible that the school system was originally designed to teach young men skills, like quiet study and deference to authority, that women either learn more naturally or get reinforced in other contexts, and the schools no longer effectively teach those skills but still reward them.
They might be referring to the TED Radio Hour "Beyond the manosphere" by Richard Reeves. I think it was on NPR a while ago, I looked it up because the "school isn't designed for boys but girls" sounded familiar.