Perhaps you're confused about what you see in those pictures.
The 100 year old seawall discussed in the article is the concrete wall at the front of the property at the water's edge.
The rock wall further out in the water, with the gap in it, is part of an ancient Hawaiian turtle pond.
The pond is named Pahonu, and that rock wall was built by ancient Hawaiians. They began building ponds like this in the 14th century.
Yes, sand comes and goes inside the rock wall, and the picture taken in 1988 is accurate.
The 1988 picture is proof that the rock wall, which has been there for four or five hundred years, neither caused nor prevented the ocean's transport of sand to and from area along the seawall at the shoreline.
The picture is also proof that the seawall, built in the early 1900's, also neither caused nor prevented the ocean's transport of sand in front of the wall.
The coming and going of sand there is due to many factors, including tide, currents, wind, weather, and seasonal wave activity.
The more you learn about the subject, the less alarming it will seem to you.
About those bones...they really are everywhere!
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