So, I finally have pictures of the z-blocks on the reef. I had to make 2 kayak snorkeling / freediving searches to find the damage. Previous depth reports of 40-50' led to me searching too close to shore the first time.
On my second attempt I kayaked straight West from the "Sidewalks" entrance to Keawakapu Beach until hitting the main deep reef. I then snorkeled towards Molokini, following the inside edge of the reef. This reef gets close to shore near the Mana Kai building with the top of the reef only 30' deep. It arcs out to parallel the Wailea coast twice as far from shore as the St. Anthony.
Photo from two winters ago; the three pairs of "main reef" blocks
are directly ahead of the scooter diver's path
The blocks are located pretty close to straight West from the "Stairways" entrance to Keawakapu Beach, with the surrounding near shore sand bottom at ~90' deep and the large main reef rising to a 40-50' deep top. This is a big and wide reef, large enough to have numerous sand channels on top at 50' depth. It is not quite as wide as Center Reef at Molokini but it is much, much longer.
There are a few "islands" of reef which are only 20 or so feet tall off the sand bottom, along the near shore side of the deep reef. Most of the damaging errant blocks are on one of those smaller reef "islands." There are also a few blocks on the main reef, as shallow as ~45' depth.
Those "main reef" blocks are seriously off target. I would consider most of the entire 1000+ blocks to be significantly off target. There is most likely more damage to reef than in either of the two recent Maui County reef damage incidents that resulted in fines. I can not see how Maui Dive Shop will be very happy if the fine for this damage is NOT at least as high as the fine they paid.
The shallowest two, at ~45 feet deep
The next shallowest pair, at ~50 feet deep
Last of main reef damage I saw, at ~ 70 feet deep
The cube shaped object past the blocks is the cage from above stock photo
Looking down on the smaller "island" reef
Looking across the sand channel from the "island" reef to the main reef