It is not “an obvious hoax” or else it would be 100% debunked by now. Given the fact that Patterson and Gimlin are adamant that they saw a real bigfoot, as well as the arm length being disproportionate, the way it walks and left footprints, the muscles being defined under the skin and its estimated size, leads a lot of reputable scientists who analyze the actual film (not the shitty “stabilized” youtube versions) to conclude it is unlikely to be a man in a suit.