That's a different thing. Can a phone be tracked while off - or can you install malware that prevents your phone from turning off while misleading the user to

That's a different thing. Can a phone be tracked while off - or can you install malware that prevents your phone from turning off while misleading the user to believe that it worked? The latter is a lot easier to believe and what you talk about. The discussion above/the post you answered is about the former.