I think it's a pure fake, the resistance will be low between the battery and the body, but the body, the cylinder head and all other parts of the car have the same resistance than the older cable you have replace. Let me show you an example: You have a very low resistance from battery to body, ok. But from the body to ignition module, injector resistor pack...it's the body or simple wire who give the ground, so the resistor you gain with the system, you lost it with the rest of body components or the simple wire.
Sorry for my bad English.