The much higher capacity 8000 gross tonne hydrogen carrier can deliver about 1400MWh, after spending 3000MWh filling it up with a bunch of electrolysers then liquifying the hydrogen which you'd have to build a floating platform for. https://en.m.wikipedia.org/wiki/Suiso_Frontier

8000 tonnes of 200Wh/kg batteries is 1600MWh.

This is dumb, but hydrogen is much, much dumber.