I think he should be fired as he clearly has no journalistic integrity. Millions of us saw the rally on TV or streaming media and so we know that stadium was packed to the rafters.
I think he saw a picture of Trump in a walkway and thought he was ready to go to the stage. That was before the building was filled. If the guy does not have a history of this crap, I don’t like to see people lose their jobs for something that is not really earthshaking.