You've expanded the definition to include nearly everyone. All states are authoritarian, in that they are all instruments by which one class wields its authority over other classes. Revolution is the most authoritarian action there is, as was liberating the slaves in Haiti, the Statesian south, etc. You've erased any analysis of what these political aims are, essentially saying only pacifists have validity, and historically pacifists have been some of the least effective, or even damaging to their movements.
The communists that wish the working class to wield that authority wield it for progressive means, and in the interest of the people. Eventually, when class is abolished, even the state itself will be too.
I suggest you read the articles I linked, you can read both in the span of ~15 minutes and you'll have a much better understanding of what "tankie" means.