There many different approaches to reading. And psychoanalitic criticism and postmodernism aren’t Marxism. Marxists dislike it actually.
What the Marxists want isn't relevant. There isn't a pope of Marxism to declare who and who isn't a Marxist. The psychoanalytic critics claim to be Marxist, and use Marxist terms and theory. That's good enough for me.
There are different approaches to economics, as well as to reading. And some of those different approaches to economics think that having the government hire folks to dig holes and then fill them up again builds wealth. Different can mean 'complete BS'.