I understand the engineering, but let's look at it after the next tropical storm grazes the area and the pilings are exposed.
The pilings vary in length but average more than 50 feet which would have them into the ground below the erosional area on the beach by more than 25 feet in most places. Not to mention there are three piles per row and numerous rows, etc... For comparison with much shallower piles, smaller diameter and wood versus concrete, look at the restroom that has survived since before Opal and various other structures along the gulf-front.