Among other tactics, they wished to be able to use the term as a dismissal of anyone who got information about their real operations. This is very well documented, and is common among intel agencies of many countries.
It is also well documented, that the CIA and others (KGB etc.), have intentionally spread disinformation, from AIDS to Apollo hoaxes, in the same channel as (limited) legitimate information. This tactic is called "poisoning the well," the limited real info is a "limited hangout." If you put those terms into any search, youll find reams of documents detailing examples. Usually, these are the actions of some foreign service, analysed and released for the public service.
When the author began to align obviously false information with more credible things, what he is seeing are these intentional networks of lies that our own services have created. These things are not organic. He identifies common psychological features in these posters, because the intel agencies strongly select based on personality.
Also, how many of the accounts he investigated are bots? Was he able to prove that real individual people were doing this?
Pay no attention to the man behind the curtain! Its been debunked already!