I'd argue the only new development is that now it's cheaper / easier to do. But the same concept has been used previously with human-augmented bot farms.
Nuclear bomb?
Now we have cameras on every major road and intersection, most places of business, most transportation facilities, and most public gathering places. We have facial recognition and license plate readers, and cheap storage that is easily searched and correlated. Almost all communications are logged if not recorded. Even the postal service is now imaging the outside of every envelope.
All because it's cheaper and easier.
It probably is true that some populations are more vulnerable to AI produced propaganda/slop, but ultimately I have 50 more pressing AI concerns.