If the only benefit to sea water is for its minerals, there are many other non sodium sources. as mentioned, seaweed for example.
Humic acid has the ability to "tie up" some salt, so its possible that the salt water from the tanks, were made un-available to the plants. but there will be a tipping point, put enough salt in the same spot and eventually, nothing but salt loving plants will grow there. in heavy soils it will just build up over time.
now if someone has found a way to extract the minerals from seawater, without the salt, then i see nothing wrong with that.