Ex-fukkING-ActlyThe problem with that is Hodor was saying "hodor" before Bran was even warging. Or, the alternative is he wasn't, and Bran retroactively changed the past this episode.
Either way, something was changed. And the writers can't really play it any other way than "it already happened, now you know the reason" because he's been saying "hodor" since his first appearance. It's not as if they could show us anything other than what already happened, anyway.
Fred.