That's my thoughts, don't know what else they could call an axis, I once saw (can't find the video) someone who put steadicam springs between a 3axis rig and the handles for it, so it would smooth out a vertical translation (aka when walking and the rig bounces up and down slightly) Which I thought was a great way to fix the problem when you want to run with a 3axis.
But my guess in this situation it's just marketing. Maybe they think 3axis quadcopter stabilization + 3axis camera stabilization = 6!
But looking at the camera, my guess there is no 3 axis on the camera. I guess we'll have to wait for some footage.