I don’t see how that generates anywhere near enough power, think about the potential energy of a bucket of water going up and down that amount over the course of a day.
Neat how? Tidal power never made economic sense. There are only a limited number of places with enough tidal flow to even potentially make it viable. Any moving parts in the marine environment require frequent expensive maintenance due to growths and corrosion. Environmentalists will file lawsuits against anything that causes any damage anywhere, even if it would be a net environmental benefit compared to alternatives.
Ocean waves aren't going to stop at night or on a cloudy day, and don't care if the wind is blowing. Yes, tidal power has its own set of problems, but it doesn't have those ones. The more amazing power source I heard about though is the enhanced geothermal power that Fervo is doing.
Both are questionable. Tidal power is super neat in theory but we really struggle to make it viable in practice. GPUs in space are probably the lower risk option, but with even more questionable economics
My preferred outlandish idea would be to put the data centers next to solar farms in the Sahara. I just don't know yet how we are going to make the batteries to power that through the night