They probably are not including the manufacturing or charging, but it is still going to be a lot better than a regular ship.
Electric vehicles end up being much better than fossil fuel vehicles even counting the total lifecycle costs and electricity generation .
Even without recycling shorter lasting and environmentally worse NMC batteries and charging them from a coal plant, ends up being better for the environment and releasing less CO2. A big study done like a decade ago on cars found the average break even point would be about 80,000 miles for a single use NMC battery charged with a coal power plant. It was under 20,000 miles for the average US grid generation, which coal is a relatively small portion of.
With LFP batteries which last a lot longer and are less environmentally damaging to make, it is even better. Especially combined with recycling, and there are already recycle a fair amount of batteries, and they are building a lot of new factories for recycling even more. The breakeven point comes even sooner.
Oil/gas/coal has an insane amount of emissions and environmental damage, not just from burning it, but also from getting it, refining it, transporting it, and dealing with all the byproducts. Getting/Refining/Transporting gasoline uses a fair amount of electricity and a very large amount of heat/pressure usually from burning natural gas, the electricity to make the gasoline for the average car has been found to be between like 1/6 and 1/2 the electricity needed to drive a similar BEV the same distance. If the natural gas used in the process was instead put through a CSP plant, and used to charge a BEV, it would go farther than using that to help refine the gasoline.
The average large coal power plant has less CO2 emissions for unit of energy produced than a gas/diesel car engine. You need to make a very large amount of compromises to the efficiency of a heat engine to put it in a car, because it needs to startup/shutdown very quickly, be able to not only change speed/torque very quickly but over a relatively large range, they don't run very long, they need to fit in a car, the speed/torque output needs to in the range for the transmission, and a bunch of other things. A large baseload power plant like coal, nuclear, CSP NG plants can take hours to startup/shutdown and once they are running they maintain the exact same speed/torque output 24/7.