I would say that since you called your schools office of greek life, and that is the advice that most people give around here for people with questions specific to their school I would say that it's true for you school. Had you come in here and ask if you were guaranteed a bid at least a few people would respond with "call your school's office of greek life and ask them." Not to say that everyone who works for a university knows exactly what they're talking about, but there is a pretty good chance the girls you talked to was telling the truth.