Until you give substantial refutations that Black isn't the color of removing counters from permanents, according to official magic and cards they printed. Yes, you can make case that the article should have added white as well, but not that they are outright wrong.
It's not parasitic, it synergistic with damage. If you are against a life gain deck, yeah you need to deal 20 corruption OR AND HEAR ME OUT - "prevent life gain". Because it's synergistic with damage.