The Daily Northwestern quotes a Rutgers spokesperson, though seems a bit confused about the sequence of events.  The Department of Philosophy had in fact voted him an offer last fall and, ordinarily, its approval at the administrative level would have been pro forma.  Once the news of the Title IX lawsuit broke, the situation changed.  It is much easier, legally, not to authorize a tenured offer voted out by a department than it is to revoke tenure based on misconduct, so this outcome is not surprising (if Ludlow had moved to Rutgers with tenure, and the allegations against him were confirmed subsequently, Rutgers would be hard-pressed to take any kind of disciplinary or  remedial action).  If Ludlow is successful in his lawsuit, the loss of the Rutgers position will figure in any accounting of damages.  (A few weeks ago, on various social media, it was reported, falsely, that the Rutgers Department had voted "unanimously" not to re-extend the offer.)