I don’t think that hacker has thought that through. Sure, he will find an infinite number of biographies which tell the story of his life up to the present with unbelievable accuracy, he, however, has no way of knowing which one of them actually predicts the future. The information just isn’t there. Oh, sure, among the infinite number of biographies there will be one which is correct, but it doesn’t come with a “authentic biography” meta tag (well, actually there will be a version that does, but so will the fakes).