This doesn’t appear to be impressive at all, unless I am missing something. It only takes 10-20hp to maintain 65mph. That is about what a Honda Grom makes with its 150cc motor or 250R makes with its 250cc engine.
The biggest problem with rotary engines is the emissions and efficiency. They are essentially like two stroke engines in that they don’t have valves and don’t separate the oil and the combustion chamber. As such is the case, they can’t modulate and control the air/fuel delivery, and they rely on injecting oil in the combustion chamber to lubricate the rotor. I am not sure how he fixed these issues without causing premature wear and failure, nor do I know how he manages the heat in the chamber that could cause metal fatigue or preignition/detonattion/knock.