I am not party to all the information, but he was never charged for the alleged misconduct and Die Zeit’s investigation didn’t find it convincing. Given how the Assange allegations fell apart, I think there’s a non-zero possibility that it was a defamation campaign.
He didn’t help himself with some public conduct/comments that painted him unfavorably. So there is that aspect to consider. But the scope of the campaign against him felt excessive at the time, to me.