Small clarification: Fangamer didn't say "No," they had offered Conrad to join for the remake, but he'd have to write new songs and also enter the soundtrack into a content ID system, which he understandably didn't want to do since he's too busy to write new music and wants the soundtrack to be free-use... Not to mention the heavy sampling could've been an issue.
Edit: Misinterpreted the description originally, my bad, but I still think this is good to know for people who may not.