It's marketing nonsense, obviously. The basis for this claim is that an electric engine can generate torque at an arbitrarily low RPM, so given low enough fric

It's marketing nonsense, obviously. The basis for this claim is that an electric engine can generate torque at an arbitrarily low RPM, so given low enough friction on the load it can move an arbitrarily massive object. That particular given, of course, renders the whole claim BS.