The 'No HV curve' on the website is based on theory only. It has to be demonstrated that there are no combinations of height and speed that are dangerous following an engine failure. Note the word 'demonstrated' if it's going to be certified.
Th Djinn evidently didn't have an HV curve, this one may well also be able to get away with no HV curve due to the weight (and inertia) of the rotor blades.
But it's a bit bold of them to be claiming 'No HV curve' before the thing actually demonstrates it.