A typical helicopter has a motor between the body and the blades. Imagine using a screw gun. When you go to tighten a screw, equal force is imparted back on your hand because it's using your hand to push against.
These designs have the rocket motors pushing between the blades and air. This means that the spinning main rotor is just sitting on a bearing and the rotor is not being pushed off of the main frame.
However. You still need tail control to point it the way you want and to counteract inefficiencies in the main rotor bearing, that is why their prototypes have a tail rotor. That said, it's not As needed. If you lose the tail on a normal single blade heli, you are in for one hell of a ride. On this, a little forward movement and the vertical tail of the heli is likely enough to keep it straight.
These designs have the rocket motors pushing between the blades and air. This means that the spinning main rotor is just sitting on a bearing and the rotor is not being pushed off of the main frame.
However. You still need tail control to point it the way you want and to counteract inefficiencies in the main rotor bearing, that is why their prototypes have a tail rotor. That said, it's not As needed. If you lose the tail on a normal single blade heli, you are in for one hell of a ride. On this, a little forward movement and the vertical tail of the heli is likely enough to keep it straight.