No one can ever ‘prove’ to those who don’t want to believe it that Trump would be incapable of, well, anything. Dead? It’s a hoax. In prison? Political prisoner. Incapacitated? He communicates telepathically with those advanced enough to receive his stable genius emanations.
At this point I think he could marry Don Jr. and livestream their honeymoon and MAGA-hatters wouldn’t even blink.