This may be a controversial opinion, but I think it's worth discussing.
"Jossed" comes from a time when TV Tropes was a Buffy the Vampire Slayer fan site, and not everybody will get the reference. TV Tropes has done away with other trope names that were obscure references, and I believe this one should be no exception. Not everybody has seen Buffy, and it's really presumptuous of TV Tropes to assume otherwise. They don't want to change it because it's site tradition, but All the Tropes is not TV Tropes.
The name is confusing for other reasons too. Joss Whedon is known for a lot more than denying fan theories. The article itself even acknowledges that Whedon is known for character deaths and shocking plot twists.
I suggest a more intuitive name. We have "Word of God," so I suggest "God Says Otherwise" to contrast that one.