Oh. Wait did this fall under the whole 'don't tell people there are other worlds' rule or not? But then Jack had called on them from all different worlds, hadn't he? So it was probably known.

"Uhhh, well at least two that I know, yeah. I've been to a different version of this place, too. It didn't have a lake like this, but it had a lot of the other stuff."

...He's probably just confusing this poor guy even more, way to go Sora.