Not exactly,
The argument then was to not use the P-lead and its shield as the way to ground the mag. Simple P-lead to one side of the switch and ground/shield on the other side of the switch with the mag side of the shield connected to the ground terminal of the mag. Like the second of Chad's dwgs above.
The argument was to use the ground terminal at the mag for just a shield ground for noise control. The other end of the shield would be connected to nothing. P-lead still connected to the one side of the switch. The other side of the switch would then be grounded to a good ground inside the cockpit using robust wire instead of a shield.
Doing it this way takes the burden of grounding the mag out off of the shield.
Either way works, which is better most likely depends on how good a job someone does with the terminations.