>>2588642It is indeed totalitarian conceptually.
For a Proletarian Dictatorship to truly triumph, it must come to encompass all of society; Nothing must be outside it or against it.
And it is by this process, as OP hinted at, that the state itself, defined in the Marxist sense as the instrument of class power itself can wither away.
The yet harder pill to swallow is that any totalitarian state almost also itself come to resemble something close to Proletarian Dictatorship. That is to say class collaborationism will never actually achieve what the corporatists say they want it to achieve (comprehensive social harmony analogous to a healthy body); Only something resembling the Dictatorship of the Proletariat can ever hope to lead to anything close to such an outcome.