Their line of thinking seems to have been “the proletariat are represented by the party of the proletariat + we are the party of the proletariat = when we control the means of production, the workers control the means of production”.

L’worker, et moi.

Just like how China is still a shining Marxist government, which is why the whole world uses them for a bunch of its production, even though the workers owning their own means of production means they get to keep a greater share of the profits and so it’s more expensive… than… yeah, something like that.