please go anywhere in cuba, proclaim this as loud as you can, and count down how long before you'll be arrested for being an agitator or an undesireable.
Are you under the impression that the Cuban government would prefer not to be referred to as a dictatorship of the proletariat? Do you have a base-level familiarity with Marxist terminology, such as the fact that liberal democracy is referred to as the dictatorship of the bourgeoisie?
Dictatorship of the _ just refers to what class is in power, not if it's a totalitarian dystopia or anything.