Are all Autonomist Marxists...Leninists?

Answer 1

The short answer would be: "no."

At more length, I have know or known of folks who identify with Autonomous Marxism who are still anti-Leninist. To my (non-autonomous marxist) eye, they frequently look somewhat similar to Platformists who speak using marxian terminology. On the other hand, a LOT of Autonomous Marxists are just Leninists trying to hop a ride on the A-train. They'll still be sure to liquidate us when they have built enough revolutionary momentum.