Board Thread:Questions and Answers/@comment-4779545-20150905085023/@comment-93957-20150906022612

Not fake. It's in a junior novel. At first I thought that it could be a "what if"/its own continuity, but Dimension X Leo's cardback specifically mentions that they're going back in time to change the past.

But regardless if it's happening in the show or not, it's an official piece of merch.