that item is supposed to work on players, why would they make a healing reduction item for mobs, 99% of mobs don't heal

edit: literally, the first 2 comments on the item in wowhead

"I like to wait for a raid to pull the celestials, then run up and throw this stuff on their tanks."
"This basically directly takes out any healers who go at pvp solo or who were accidentally flagged."
I got a few today. Unfortunately against some hunters it's not even working. They don't have the Dew buff, they are somehow going into godmode where you cant damage them at all. Whatever they are using isn't showing up under their character bar.