Marxism is about the politics of the underclass - the revolutionary struggle to achieve a just society by upending the inequities of Capitalism. So the proletarian uprising wrests control of society from the bourgeoisie.

Cultural Marxism redefines the oppressed and oppressor along the lines of identity rather than economy. This makes it much more palatable to a capitalist society.

Ah, so it's just like Marxism, except without any of the discussion of Capitalism? And its an ideology about identity, which you feel sets it clearly apart from other ideologies?