Milner displays no philosophic thought in this critique. Political and literary criticism, maybe.
His books (and, by extension, his ideas) aren't selling, and this is his way of achieving notoriety and perhaps boosting the bank account as well as invitations on the cocktail circuit.
Only one of his titles is currently available as a new book at Amazon US, and it's a Spanish language translation. Everything else of his is only available used
And this Spanish language title is ranked in sales at #5,127,585.
Amazon.com El Paso Filosofico de Roland Barthes Books Jean-Claude Milner
By comparison, Immanuel Kant's major works are all easily available as new books, and his essential Critique of Pure Reason is currently ranked at #53,414 in sales, or almost a hundred times better than Milner's only work that's still in print in the USA.. And Kant has been dead for over two hundred years.
Although I'm sure that Milner is selling better in France, I have no doubt that he would like to become relevant in academia and perhaps he thinks that by expounding upon one of the most popular series of books of all time with an (easily discredited) political theory is his attempt at generating interest. It certainly can't make his sales much worse than they already are.