Technically you are correct, but mine was not on that tight so it came right off with minimal effort. Yes you could start the engine with torque wrench if you were spinning it clockwise. Counter Clockwise won't start it though.That's not quite correct, CF.
There are repetitive strikes against the mandrel inside the tool. The exterior stub of the mandrel is what the socket goes on.
Those impacts loosen the fastener. The kinetic mass of the flywheel may prevent it from moving much, if the nut comes loose quickly.
Otherwise... well, some people use impact guns to start their engines!
Hope that helps
rc