Nah, first premise is false in more than one way. You are conflating the ideology Stalin made with Marxism.
The second error is that there has never been a dictatorship of the proletariat, every time it has been a political party that seizes power for themselves and not the workers. In doing so they become the ruling class with differing class interests than the workers.
Marx must be rotating in his grave with the speed to power the whole globe at this point.