Sorry, but this story is fatally flawed. A ground rod will NOT "ground" ANYTHING.
All that happened here is (part of) the pool system got bonded.
If the walls and supports of the pool are metal, and they are buried in the same dirt as the ground rod.......what purpose is the ground rod serving??????
The pool is it's own ground rod!! Sinking a ground rod is utter nonsense.
NO ground rods are EVER required to bond a pool! Electricians who are not familiar with pools use them all the time because they do not care to read Art. 680 and familiarize themselves with the proper way to bond a pool.
Sorry fort he rant but this is a contentious topic with me.