Acidification is due to the water holding more carbon dioxide (carbonic acid) than baseline, right? This proposal is to turn carbonic acid into calcium carbonat

Acidification is due to the water holding more carbon dioxide (carbonic acid) than baseline, right? This proposal is to turn carbonic acid into calcium carbonate, which 'removes' the carbonic acid from the water. So this would reduce acidification (at least until the water absorbs more carbon from the atmosphere). Am I missing something?