What you quoted above actually kind of reinforces GP's point. And if you read the article you cited it agrees with GP.
> [W]hat I think many people outside our profession don’t understand is how unfortunately unequal all aspects of secondary education are in this country. And unlike some other inequalities — like access to fancy internships or expensive extracurriculars — our empirical research shows the SAT/ACT actually do help us figure out if someone will do well at MIT.
> It turns out the shortest path for many students to demonstrate sufficient preparation — particularly for students with less access to educational capital — is through the SAT/ACT, because most students can study for these exams using free tools at Khan Academy, but they (usually) can’t force their high school to offer advanced calculus courses, for example. So, the SAT/ACT can actually open the door to MIT for these students, too.
> [W]hat I think many people outside our profession don’t understand is how unfortunately unequal all aspects of secondary education are in this country. And unlike some other inequalities — like access to fancy internships or expensive extracurriculars — our empirical research shows the SAT/ACT actually do help us figure out if someone will do well at MIT.
> It turns out the shortest path for many students to demonstrate sufficient preparation — particularly for students with less access to educational capital — is through the SAT/ACT, because most students can study for these exams using free tools at Khan Academy, but they (usually) can’t force their high school to offer advanced calculus courses, for example. So, the SAT/ACT can actually open the door to MIT for these students, too.