It was a Title IX investigation and schools usually don't take those lightly. But most of his conduct was alleged to have taken place in direct messages on social media platforms. Those seem quite easy to find if they actually existed.
Personally, I spent years and thousands of posts making sure I ruined my reputation on that old board and neither my username nor anything else transferred over. And now I have to do all that work again. It's just annoying.
Listen, just because the illegal poker ring was named "Arenas Poker Club" and the logo was someone wearing Gilbert Arenas' jersey doesn't mean Gilbert Arenas is guilty of this. Shame on you for all jumping to judgement.