Hmmm... well, my immediate response would be that no glider of any kind produces forward thrust, by definition. The Gyroglider must, like all gliders, tilt its lift vector forwards to generate 'thrust'. However, that's exactly what helicopters do, too, so perhaps you're right...
I admit I'm no aerodynamicist, but it seems that a key difference between any helicopter and any autogyro is that the net flow of air is down through the helicopter's rotor disk but up through the autogyro's rotor disk. In both cases, there must be a downward acceleration of the air, to produce an upward force. This requires the gyroglider to be descending through the air, just like a fixed-wing glider.
I'm convincing myself that the gyroglider is actually more similar to a helicopter that a powered autogyro. My understanding is that a powered autogyro in straight-and-level flight gets all its thrust from its propellor, and the lift vector from the rotor must actually be tilted back slightly, in order to get the required airflow through the disk to keep it spinning...