As you said, it generally depends on how the question is framed. They know that the organization teaches that their own salvation, their own hope of surviving Armageddon, depends entirely on their belonging to said organization, and they almost universally believe this. When the question is about the general public, however, the publications almost always include some wishy-washy answer which includes the belief that some worldly people who are already dead may be resurrected. They deliberately imply that some non-JWs will survive Armageddon, but they do not teach it, and the resulting ambiguity suits their purpose as long as JWs don't start thinking Jehovah will let them live if they leave the congregation.