Spoiler Well I said "may". There's no way to know for sure yet. Though I doubt he fully believes it to be false through and through. Perhaps it's more a case of finding out that certain schools of thought within Jedi teachings were repressed or extinguished over time (like you find in the history of Christianity) and perhaps he feels that the ones who won out weren't necessarily the right ones. And you have to admit, if your religious order requires you to take young children from their families before they can form strong emotional attachments and try to prevent them from ever doing so to sustain itself, inviting all of the problems that can come with that, then maybe your order shouldn't last.