User blog comment:IamJakuhoRaikoben/Chapter 473: Red Lightning, Review./@comment-5143845-20160215212107/@comment-5303512-20160215235126

No, it didn't fix him, other wise all of his wounds would be healed without a scratch.

Well this is not the condition back during the Tartaros arc where the MBP was actually killing him, this is something less lethal, more of a painful stage.

From the name sake, it feeds off of magic particles acting like some sort of blockage which can hurt him, other wise, why call some disease Ethernanos Barrier Particles if it prevents Magic from getting to him. Plus, what Wahl used isn't magic, it was just a Nullifier, just gets rid of barriers.