Technology

Big part of this would be that its a foiling boat and that massively reduces drag from the water. Keeping weight and drag down are the secret to improving efficiency for EVs be they boats or cars. Any decent marina its easy to get multiple 22kw shore supply as well, it can be expensive and metered but you aren't going to be waiting that long to recharge your boat.

Electric makes the most sense on sail boats as they already have a green source of energy, and thanks to hydro they can convert some of that motion generated by the wind into charge for the batteries. Couple with solar and you start to look at a decent amount of energy generation.

Sail boats also tend to have far less powerful ICE than your average motor yacht, so you need less powerful EV motors to achieve the same speed, and in the right conditions you only really need the motor getting in and out of the harbor so your battery bank is smaller and lighter. Plus you could make the batteries do double duty as the house batteries as well.

The trick will be to get the super rich out of their shitty super yachts that burn a couple of thousand dollars of fuel per hour, they could already have sail boats but choose not to for the increased living space that they can get out of the same length of boat due to being able to build much higher due to no masts.