It still doesn’t solve the issue.

Two of the major problems is brine doesn’t homogenize well and its denser than seawater. You end up brine that settles into ever nook and cranny on the sea floor without mixing back into the ocean.

Probably a solvable problem, but not something that has a good solution right now.

Pump it through pipes with holes in it, so that it leaks n% brine every x% miles. This assures dilution of the brine.