This article is a bit confusing because it speaks broadly about “graduate schools”, then gives somewhat specific observations about particular MBA programs.
Admissions to elite MBA programs is primarily concerned about an applicant’s work experience, successes while working, & one’s career goals that justify the need for an MBA. Of course, this is just for the elite MBA programs as most MBA programs just need a pulse, an undergraduate degree, a GMAT or GRE score & a check.