I read an article on it several years back:
In addition to having storage, water system, mowers, etc underneath...it also has a custom built and very expensive suspension system. Doesn't matter how choppy the lake is, when your on it, its pretty damn solid and not moving a bit. Seeing the water move in your periphal vision plays tricks with your mind and you feel like you have to keep your balance when walking around..its pretty cool!
Those pictures are also good in showing how pretty many any ball that hits the green will stay on it. At the worst they'll get caught in the flower beds of which is a free drop. The pictures also don't do justice to how large the green is. It really is a massive target even when it plays long'ish like the day I played it, 165 yards into a 2 club wind.
While it is a tight piece of property, there is plenty of space around the clubhouse where a similar length par 3 could have been built. They have a massive parking lot, sizeable range, boat dock area, corporate outing area, and 4 tennis courts in the general vicinity that could have been easily designed otherwise to fit this hole in. I'm also guessing it was purposely built to attract attention and publicity.
I must admit, i was thinking about it several holes before I got to 14 and I gagged it...chunked my 1st shot and 2nd one bounced off the dock into the agua.