Rodger's Beach is just like a regular beach. Those rocks behind her have jagged edges and look coral like in appearance. They go all the way out so trying to walk out to get waist deep is very difficult and much more difficult if you have no shoes on. jmo
If that's true, then that particular location is most likely not the correct location. Even GG would know better than to claim that they walked through coral to get to the water. Other reports suggest that they drove further out and were closer to there the surf breaks.