What happens then the predictions of Marxism don’t happen? Postmodernism is a solution to this. When the data and evidence is against you then you can go on the offensive and say everything is relative and deconstruct everything as a rhetorical strategy.
“Stephen Ronald Craig Hicks is a Canadian-American philosopher who teaches at Rockford University, where he also directs the Center for Ethics and Entrepreneurship.
In 2004 he wrote a book named “Explaining Postmodernism: Skepticism and Socialism from Rousseau to Foucault” which was e.g. recommended by Jordan Peterson for understanding postmodernism YouTube“