If you're in your pool, and the severed cable hits the pool or the motor armature shorts or whatever, you DO NOT FRY, because EVERYTHING is BONDED back to the motor armature in a loop, including the ground post which ends up just becoming an extension of the pool wall or anything else metal that is bonded, it has NOTHING to do with GROUNDING in THIS particular scenario, the only time the rod is beneficial above and beyond being a metal stick in the ground is when lightning strikes....when lightning stikes, you don't need a bond, and the system now works as a lightning ground.
Remember that with or without a ground ROD, you still have a ground that is connected in the the exact same way, the only difference being it is a thin wire that runs back to the house, this wire cannot withstand the current produced by lightning, but is fine for any malfunction related to your equipment.
So, the only reason you're putting in a ground rod is to allow you to ALSO deal with safely dissipating the IMMENSE current produced by lightning which the little wire running back to the house is UNABLE to do for you. In my opinion, it's a pretty good reason to do so.....but hey, you only live once.
If Grounding your pool properly is a safety concern, then pumps and lights should not ship with ground wires, you would not have to run a grounded circuit to your pool, and last but not least you would have to build your pool on top of something like a rubber membrane or pink styrofoam that stretches beyond the reaches of the pool wall because the ground it's built on, the same ground the wall channels sit on is definitely not an insulator.
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