I read the article. It sounds more like practically everyone is stuck in a steady state of believing the same "tells" like fidgeting, averting gaze, and stuttering they have been told forever, and those things don't work. That's not really like a GAN at all.

Additionally what you say about being able to spot the average liar, as an average person, is contrary to the article. I would encourage you to read the article more carefully to distill the main points.