It needs work. I see no problem with the central structure, except for dealing with wave-height. Those arms don’t look flexible, so that’s a big problem with structural integrety.
The central hub reminds me of Frank Lloyd Wright’s ‘tap-root’ foundation, from the mile-high city-scraper he designed. As long as it’s not allowed to fill with water or run aground, it should work the same as a sea-spar. Instead of going up, they spread the water-line up volume, into a disk.
I think, instead of leaving a big hole in the center, it wouls have to be covered… Maybe make a sea-spar/monolithic dome?
If you can’t swim with the big fish, stick to the reef