Isn’t claiming to be a Marxist state while still maintaining power within a small group of people (the inner party, a political version of the bourgeois) worse? By effectively being the same power structure, it allows critics to dismiss Marxist ideals as the same or worse. China is a particularly bad case as they disallow proper freedom of speech, basically castrating the proletariat. This harms perception of Marxism, hurting your case in arguing for it