It's accepted that the definition of Non-fiction is whatever Stephen Colbert says.
As are all definitions.
- Perfect example of Non-fiction, when George H.W. Bush announced weapons of mass destruction in his state of the union before invading Iraq. That information is called a fact, and you can't dispute facts. People always try to disprove these undisputed facts as fiction which is probably due to the same conditions as what leads to conspiracy theories, see fiction.