A few quick points:
-
None of it was satirical.
-
Marx claimed that he wasn't a Marxist as a response to those of his time labeling themselves Marxists. He still developed what became Marxism as an ideology.
-
The dictatorship of the proletariat isn't one person, but the absolute rule of the entire working class itself over capitalists. It's saying that workers run the world, not capitalists, ever again, and that when there are no capitalists all workers will simply be people, a classless society.