He might have been “eligible” but the members did not have to vote to admit him.
They kind of did, if you listen to them tell their stories. Older members of the sorority were knocking on people's doors to make sure that they'd voted and telling anyone who might consider voting against him that their values weren't compatible with the sorority's and they should leave - a message passed down from the national head office of the sorority. The vote wasn't anonymous - a special exceptional procedure for this guy, as the process is normally anonymous. They also seemed to have waived the grade requirement as a special exceptional procedure for the male "sorority sister."
I'm actually amazed the sorority couldn't find a more photogenic/appealing test case. Or one who at least met the grade requirements. Or at the very least, one who could keep his hands off his dick. This guy is such an obvious example of someone who shouldn't be there. Or is this what you select for, when you select for men who want to invade women's spaces against their will?