There are two possibilities. One, they are lying. They do have a waiting list. Two, they are not done with reviewing all the application folders.
I know someone with one first-authored TIER 1 OR journal paper was turned down by northwestern last week. Meanwhile, another guy with a lower GPA and no publication is still under their consideration. The only thing the second guy exceeds the first one is GRE Verbal, but I don't believe that plays an important role, even a role, in the applications.
Do all of you guys here have a master degree and publications?