Yes you are correct with those figures, but the new one goes up to 10:1 and 6S to keep the speed up.

I should point out, Hardwired II has a lower ratio (less torque) and also about 4kg shy of Satanix (I was tipping the scales on Thursday), an mine also has the vast majority of that weight on/on top of the wheels (my lid is 1.5kg, I have a bar of 10mm steel attached to the motor gearbox plates, my front wedges are hollow).