I see your point, my mistake. However there are still many arguments to be made for this strategy. First of all, in terms of carbon capture it is much easier to capture carbon at a factory then on a boat, or any mobile vehicle for that matter. Secondly, arguing that diesel is equal is ignoring that diesel needs to be transported to and from the fueling station, and extracted from the ground, this should be factored into it's emissions (I'm not sure how). As far as I know moving electricity is far easier than moving liquid fuel, as long as you are in a preexisting industrial zone.

So I do agree, perhaps on a pure emissions standpoint they may be more equal than most think, however in terms of environmental impact batteries seem to be able to cater to technological advances (carbon capture and better manufacturing with scale) much better than diesel (which you NEED to burn to use).