"PR" was invented by the military. I learned this from someone in PR who was trained in the service during WWII and then went on to work in the "public relations profession" as a civilian. I suspect the military trained Bernays. He may have invented the "profession", but he did not invent PR.
Turow, Joseph (2008), Media Today: An Introduction to Mass Communication, Routledge (New York), at 627, 631
"If you are refuting the article..."
The article made no mention of public relations nor Bernays. I was responding to a comment that cited a YouTube description. I am familiar with Curtis' documentaries, including the one in the video. I enjoy them. However, I believe he makes them as art, for entertainment purposes, not as a teaching tool. His comments in interviews seem to support this view.