Revisionist history, or really revisionism in general, sometimes gets a bad rap. One of the coolest revisionist areas we’re aware of currently is in archeology in the Americas where one radical camp has argued, among other things, that the Amazon was heavily populated prior to European contact and that the accepted argument for how humans got to North America - by crossing the Bering Strait - may be entirely wrong. Some now argue that people sailed down the Pacific coast and only moved north after the Ice Age let up.
It’s a slow process to figure out who’s right and the academic fights are entertaining if you enjoy that sort of combat.