I heard about the recovery of some artifacts from St Exupery's P38 but not the Rippert thing. I have to say it rings true. The way he admitted it over the phone to Von Gartzen. It kind of sounds like the way a murderer whose conscience has been troubling him sometimes admits his guilt the moment the policeman knocks on his door. Not that Rippert is a murderer just a fighter pilot doing his job.
It would be extraordinarily ironic for St Ex to be shot down by a fan, tragic but poetic even.