Nothing in your article says anything about the education of the top 10% in that school.
Are you just assuming the behavior of the bottom half is the same as the top 10%? Why would you do that?
The bottom half of that school needs serious attention! Those kids are not being given what they need.
But the top 10% may be doing everything they can with the system and, for example, if they are the only ones showing up to class, they may be getting exactly what they need to succeed at college. You don't know any different.
I think what he's saying is that colleges that accept the top ten percent of a school student body can still get inferior students.
I agree that he is claiming that, but his artile does not support his theory. He has not shown any information that demonstrates that the top 10% of a school with a terrible bottom half, are also terrible.
I agree completely that there are many schools that need significant change and help. (My personal list includes making the schools SMALLER and increasing the teacher:student ratio, as well as comunity aids to help step in where families cannot).
But it sounds like he is proposing the solution that if the bottom half of the school is terrible, you can use this to keep the top 10% out of college programs. Without any data on how the top 10% is performing.