Trump - Well known billionaire. Notable TV personality for 30 years who is somewhat charming / popular with a significant portion of the electorate.
Flynt - From the depths of the uncanny valley, a demonstrably mentally ill fantasist with delusions of grandeur and total denial of reality. Personality so abrasive that he has no friends and isn't even tolerated by the most subservient acolytes of the progressive stack. Repugnant to 99.99% of functioning adults within ipad throwing distance.
The electability of Trump was laughed at, rightly so at the time perhaps (he had also run for office before and completely failed), but the chance of him winning was still better than 1 in a thousand.
Johns chance of winning anything other than the special olympics is zero. He's on a completely different scale to Trump. It's like comparing a quadriplegic to the slowest 100m qualifier at the olympics. The sprinter has an almost zero chance of winning, but still at least has a chance. The quadriplegic can only wriggle around and shit the bed.
He has absolutely no talent or merit to speak of and, more importantly, this is something that would get bipartisan agreement. I cannot think of an event apocalyptic enough that John could win any office of any value in such a way that the world would have been worth living in immediately prior to him winning.