The guy interviewed is actually the gentleman that was in charge of destroying all the spare parts at the end of the SR-71 program So he knows what he is talking about and is well known. Old interview here: https://youtu.be/mQse_XLxcWM?is=JASvQNI_bVn_bAr7

The remaining members of the quickly dwindling Blackbird community ( maintainers and flight crews) are very skeptical that it can be done but it does not mean that Isaacman is not trying.