What does Bannon have to do with the article or the effect?

It's a 100 year old discovery that's been used by everyone in the media for decades. It's why films have editors. It's why news companies edit their interviews. The article even has a hitchcock example.

"In the first version of the example, Hitchcock is squinting, and the audience sees footage of a woman with a baby. The screen then returns to Hitchcock's face, now smiling. In effect, he is a kind old man. In the second example, the woman and baby are replaced with a woman in a bikini, Hitchcock explains: "What is he now? He's a dirty old man.""

Bannon does it, but so does everyone in the media.