Helix Cables are utter nonsense, as is the verbiage on the web page.
The same current flows in all parts of a circuit. The -ve terminal may remain @ 0v relative to earth ground, but it is positive relative to the +ve terminal over ½ cycle and thus
current is flowing out of the -ve terminal re
conventional current. Electron flow is in the opposite direction.
They will sound different, maybe better in some systems, but their 'science' is flawed. Good amplifier designers try to avoid additional inductance in the output stage.
They are simply more inductance, a LOT more - maybe 2000x more than zip cord, in the -ve wire in a sort of transmission line geometry.
Scroll down to Amplifier Output L and R in the middle of
http://ielogical.com/Audio/CableSnakeOil.php and see what adding a few µH does. Image what 5mH will do!!!