Bolton ripped Trump right after he left. The story is likely an accurate representation of what Bolton said. Bolton was a spy and saboteur inside the Trump administration.
The proof... Bolton has not and will not appear anywhere forcefully denying this crap and supporting Trump.
He is a lying backstabbing swamp creature as treacherous as can be imagined. He is one of those “we resist from inside” types as was in the famous editorial in the NYT.
Everything else is your imagination.
I don’t doubt that Bolton is angry and shouldn’t be trusted. I’m just saying that he must not have said much to Fiona Hill, or I’m sure the leaks would have been crafted to be a lot more damning against Trump than what they were.