Breitbart recently published an article about "leftists" planning to show up at the Gettysburg cemetery to burn flags and desecrate graves.  The group accused of staging the event repeatedly denied any such plans, but Breitbart went ahead with it anyway.  As a result, a gaggle of heavily armed "patriots" showed up.  There were no flag-burning "leftists".  One managed to shoot himself in the leg.  Did Breitbart fire anyone?
Breitbart also published an article a few months ago claiming a Guardian story was "fake news".  The Guardian responded with a detailed account of its sources, proving that Breitbart either hadn't done its homework properly or was lying.  Breitbart's response?  None.
Obviously TCampbell24 doesn't mean "...CNN has no problem with publishing fake stories just as long as reporters follow guidelines."  Simply, if reporters from any outlet follow the guidelines, sources will be checked and the story won't be fake.  These journalists didn't do that.