Several years ago I saw on the Discovery Channel where there was some research done on a different way to use the sea to generate power. It involved
using thin & flat flotation devices linked together so that they would "bend" in synch with natural wave-action...With small hydraulic pumps that
would be oscillated with each wave-motion...The hydraulics themselves would be transferring the power to an on-shore generator.
They only showed a model-scale mockup of that setup...Your link reminded me of that & has me beginning to wonder what happened to that idea and/or why
nothing else has come of it.