A source is a person you actually have talked to in person or on a phone. It isn't someone whose post you read on a message board. At least Disneysource made up a story about some relative. He probably doesn't exist, but if he does he would actually be a viable source.
Since when does a source have to be person you've talked to directly? As far as I can remember, you can count a person as a source if you've read something they've written. This would be books and articles, and in today's world, even websites.
To be fair, there are such things as primary sources and secondary sources. A primary source is someone directly in on the know about the topic. A secondary source is, well, anyone else. But in neither case are you required to have spoken with them in person. Certainly permissible, but not required.
In the context of this Norway ride change, a primary source
could be a member on Disney's executive board, a high-ranking Imagineer, or the Disney World Website. A secondary source would be the wife of a Disney executive, Bob Iger's best friend that's outside of the Disney family, a WDW Resort bus driver, the blog of someone who talked to a WDW bus driver, someone who read that blog, this (and other) forums, a random guest you met in the line of Splash Mountain, any news website (whether or not dedicated to Disney), a blurb on CNN, etc.
As such, there are varying levels of credibility within secondary sources. Some could be highly reliable. Others are highly suspect. And even when it comes to reliable individuals, it is still hearsay. And due to this uncertainty, secondary sources are not ideal for research, or for references. But they shouldn't necessarily be ignored altogether, either, especially when they are connected to a primary source.
In this scenario, we apparently have someone who claims to have listened to someone who is in the know. And this is where primary/secondary source issues get muddled. Assuming the author of the article was in fact in the meeting in question, he, and his article would be primary sources about what went on in the meeting, because the author was there. Even if it's something on a website. This means the claim that they have privately announced to make the change would come from a source -- a primary source. But as to whether Frozen will actually come to Norway, the author is a secondary source, since they aren't involved in the alleged project.
And this is what makes the topic in question such a great debate as to whether this transformation will transpire, because we just don't know, yet there is supposedly strong evidence it will. At this point, the readers must ask themselves, was the author really there, and do they have a proven track record? From that point, the reader decides for themselves if Frozen is coming to the Norway pavilion.