Stanford is 1/4 Asian, plus another 9% "international". UC Berkeley is about 40%, plus another 10% international. And as I said, it's about competition for the elite slots at those and similar places. Look at, eg, the student body composition at very "hardcore", high stress schools like Thomas Jefferson HS, or Gunn HS (recent subject of http://www.sfgate.com/bayarea/article/Why-are-Palo-Alto-s-ki... ).
The parents of students in that kind of environment are the intended target of this editorial. It provides them with a coordination point.