[kapodc]

Not completely. The Postmodernists do use language to shape people's thought by redefining words and eliminating wrongthink words. And they have been successful.

But they mainly influence people who are not thinking to begin with. Or, to put it more mildly, do not have time to think about every issue and therefore adopt the current mainstream propaganda.

So in the sense "Can we conjure up a fake reality that many people will believe?" they are right". In the sense that "language is reality or even thought they are of course wrong.