The whole logistics of this misadventure don't make sense. We don't even have any determination for what allowed these specific characters to retain their memories in the new timeline other than that they're real life regulars of the Picard tv show. It's not who was on the Stargazer as Raffi and Elnor weren't there, and it's not the Starfleet squadron otherwise the Confederation would have had an entire uprising of an army of people who remembered the Prime Timeline.
Furthermore, Q specifically mentioned that Picard's new body was also synth, and Seven's body has never had enhancements. That means that Elnor, Picard, Seven, weren't physically transported to the new timeline, but had their minds transplanted into the bodies of their evil counterparts. In the event that Elnor's "real" body is still alive, it may be possible that he does indeed survive, but it's also possible this would just be evil Elnor in real Elnor's body or something.