“Khrushchev ultimately lost his job for making that deal.”
First I heard of that, wouldn’t surprise me although Khrushchev also gave the Politburo some other good reasons to can him.
Also, if it was the case regarding Crimea, why didn’t Brezhnev reverse that idiotic decision?
Probably because Brezhnev never anticipated that someday the Soviet Union would break up.
It wasn’t the official reason K got tossed, but it got the ball rolling.