Does Machine Unlearning Truly Remove Model Knowledge? A Framework for Auditing Unlearning in LLMs. - Haokun Chen; Yueqi Zhang; Yuan Bi; Yao Zhang; Tong Liu 019; Jinhe Bi; Jian Lan; Jindong Gu; Claudia Grosser; Denis Krompass; Nassir Navab; Volker Tresp (CoRR, 2025)