https://en.wikipedia.org/wiki/Post-truth
Since when did objective facts drive or shape public opinion? When did humans ever live in a "truth world"? Take the title and the content of the article itself. Does it aim to arrive at an objective truth or to play on our emotions? When's the last time you consumed media and thought it tried to instill some truth rather than it tried to make me feel someway?
We've always lived in a 'post-truth world' because people are moved by emotions rather than truth. Humans weren't mentally ready for the printing press, newspaper, radio, tv, etc saturated post-world either. But here we are. Go read about the history of printing press, newspaper, radio, tv, etc. The same story. Politicians, priests, journalists, academics, etc claimed these new media technologies were a threat to truth. Feelings and emotions rule mankind, not reason and logic. All AI does is make it a more efficient post-truth world.