Sum 41’s Deryck Whibley slams Greig Nori's denial of sexual abuse claims: 'I'm not a liar'. Sum 41’s Deryck Whibley is issuing a challenge to Greig Nori after the Treble Charger frontman denied the singer’s claims that he sexually abused him. In his new memoir, Whibley, 44, alleges that Nori, 61, pressured him to be in a sexual ...