There's a lot of wild hysteria about this!
The only evidence was used related to the sexual position used, and words she used to 'give consent' which were the same as she had used on 2 other occasions where she had consented, and this was not used to say she had consented (or was in a fit state to do so) - but to investigate whether the defendant had reasonably thought she had given consent, even though the woman couldn't remember.
The fact that the words used were the same meant that the defendant could reasonably have thought that the woman gave consent. (Also do you get to choose the position if you are raped? that's another question but it wouldn't be my idea of rape).
It is not the case that the info was used to discredit her.
I think she still comes out of this looking like the innocent (if unwise) party - the men behaved very unpleasantly imo. Even if what they did wasn't a crime it was definitely ungentlemanly.
The worry is that it took Evan's rich girlfriend's dad to pay for the appeal. What if he'd been poor?