I guess pointing out that the magnet appears to be a permanent magnet, and hence would be directional, but the movement of electrons is bidirectional ... would be a waste of time? How about placing something magnetic around the cable is likely to create inductance, which will impede signal flow? No?
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High Fidelity Cables has a patent on Magnetic Conduction. They apply a strong magnet around the conductor which accelerates the flow of free electrons inside the conductor. It happens on the molecular level. Current flow is basically not more than free electrons traveling through a conducting material (copper, silver...). These free electrons usually bounce around a lot. The applied directional magnet straightens them out to a certain degree which results in a much higher efficiency of the flow. And this is very beneficial to sound applications.