A third is about as common as astigmatism in >50 year olds (like me, for instance!) I wear glasses to accommodate this disability, and as a result have nearly no practical problems due to it.

I don't think a problem having a high frequency means that we should decide it doesn't matter or need rectification.

Current estimates place it around 20% of the population. Wouldn't take a whole lot of sampling error in admissions to result in 40% of admitted students

I think, broadly, this is what neurodivergent people want. Nobody considers having poor vision a disability despite it nominally being one since it's so well accommodated. And it's so well accommodated in part because it affects so many people that it's normal.

The world right now doesn't do a great job of "by default" accommodating people with the broad class of difficulties experienced by people that fall under the umbrella of neurodivergence and takes as given that everyone is in the 70-80% group. So now it's a disability with doctor's visits and paperwork and specific individual accommodations when it very well could not be.

It's a way to separate us so that we can fight about it and not focus on the important aspect which is to provide everyone the help they need and deserve to make a successful life for themselves. Some may need more help than others, and so the powers that be who want to keep all that profit for themselves target those who need more help with dumb articles like this one which spread FUD.