Oh, I wouldn't say you were gulliable. (Although, I'm sure you might find others on this thread that, um, would? Eh hem, Mark, *cough* *cough*)
As to how you would find out if it is true? Well, it's doubtful that you could. Unless Roy Disney makes some sort of statement pertaining to the topic and that's probably doubtful too. I would imagine that
DCL wouldn't release that information unless given permission to do so.
As for why someone would make that up? Who knows. I've heard so many outrageous rumors from Disney guests, Disney CMs and others that I wish I had a dime for each one.
Here's an example: My mom cruised with
Royal Caribbean last summer. Her waiter actually told her that DCL was actually owned by the parent company of Royal Caribbean and that they just didn't disclose that info.