I've been to that spot a bunch of times, they used to close it off to people when the seals would take over the beach, if there were just a few they'd let people go down there too. I remember once a kid was swimming underwater and a baby seal swam up to him and their heads both came up out of the water at the same time face to face about a foot apart and it looked like something out of a movie.
There is a tidepool area near there too and we had a sealion pop up out of the water and come "bark" at us before too but he didn't do anything else. I stopped going there because they had completely closed the beach area to people and the water always had a "contaminated" sign likely because of the waste from the seals and sealions.