For the sake of this thread I thinks it's defined by the use of the word films.Yeah the film sensor is 2.20:1 at 6k resolution and the lens it uses is a proper 65mm lens. It is a legitimate 65mm camera, just doesn't use film.
So the question is is 70mm defined entirely by whether or not its shot on celuloid. With the 765, that no longer seems to be the case.
Then someone can start a thread called 70mm Digital Cinema. There is always the possibility that some future movies shot entirely in digital could be released on 70mm film, why I wouldn't know, but maybe nostalgia or to get that look. 70mm digital cinema at very high frame rates like what Doug Trumbull is doing would elevate the medium even more, but it looks like that could take some time.