A few thoughts....
Most of the word of mouth on "Sweet Water Organics" is good, but they closed and defaulted on 1/4 $million loan, and weren't paying what few employees they had. Why, for real, did the garden fold up? Did they charge so much for the food that no one could afford it? Were they unable to grow it at an affordable price? Did all the electricity used by those flourescent lites cost too much? This sort of data is needed to avoid making the same mistakes.
If the seastead is replenishing water for the farm with distilled and rain water, it's going to be mighty short on minerals in the water. How can that be fixed?
Does anyone know how he is feeding the fish, and at what cost? Fish is a fine side effect for keeping the restaurant supplied with oil-free fish, and keeping the garden fed with nutrients, but at what cost? Sure a seastead should have the water storage tanks anyhow, so that's not really a cost, but the fish food is a cost, and fish food costs more than plant food (a seastead can make free plant food), so what's the fish-feeding costs? For a seastead, it must be lower than what people on youtube are paying.
There's a number of youtube videos showing horizontal planter pipes and perfectly level beds of floating plants, but how can you use those on a floatie in the wave zone (no matter what it's made of or how big it is), what with it bobbing around and sloshing the water all over the place? I am nixing sprayed root systems because of the energy to run the high pressure pumps, but dripping water may be workable.