I think Ellul was referring to modern propaganda techniques, given simper ones work quite well. This quote from his Wikipedia page is :chefkiss:
> Also within Propaganda Ellul claims that "it is a fact that excessive data do not enlighten the reader or the listener; they drown him. He cannot remember them all, or coordinate them, or understand them; if he does not want to risk losing his mind, he will merely draw a general picture from them. And the more facts supplied, the more simplistic the image" ... Additionally, people become "caught in a web of facts they have been given. They cannot even form a choice or a judgment in other areas or on other subjects. Thus the mechanisms of modern information induce a sort of hypnosis in the individual, who cannot get out of the field that has been laid out for him by the information" ... "It is not true that he can choose freely with regard to what is presented to him as the truth. And because rational propaganda thus creates an irrational situation, it remains, above all, propaganda—that is, an inner control over the individual by a social force, which means that it deprives him of himself".
https://en.m.wikipedia.org/wiki/Jacques_Ellul