I agree that the separate generator turbine seems unnecessary at first sight, but if best efficiency of the propulsion motor/propeller and generator/blades varies significantly due to speed, it may be worth doing. I expect they'll determine which way to go as the design is refined. What they show in that illustration strikes me as just a basic concept.
Re batteries/panels plus wind, if space and weight weren't an issue that might work. As this is eventually intended for an ocean-going cargo ship that will have to float, batteries/panels strike me as an even longer shot than this. Solar-powered cars, which require much less power/ mile and have a much greater proportional exposed surface area for panels than would be the case here (as the sails & masts would block many of the modules) have never shown much practical value for long-range propulsion or cargo-hauling; running auxiliary loads is a different matter.
I await test results of this, without any great expectation of practicality.
Guy [I have lots of experience designing/selling off-grid AE systems, some using EVs but don't own one. Local trips are by foot, bike and/or rapid transit].
The 'best' is the enemy of 'good enough'. Copper shot, not Silver bullets.