Hilife is absolutely right.The canted tail rotor produces lift and thrust ,as does the main rotor.This qualifies it as a helicopter.The X2 prop only produces thrust and becomes the driving force in forward flight,not the rotor system which is actually slowed to produce less power in forward flight.
The Lynx got away with it because the power was all through the rotor system and the aft facing engine exhausts produced only the residual thrust as is common on many helicopters, such as Bell 212,Hughes OH-6 .Some others redirected to one side ,to counterct torque and others up into the rotor system.