When you're Earth 1 / Water 1 , you Defence goes down by 25% and mdef goes up 25%. When applying this to Asura, it's irrelevant cause ASURA IGNORES DEFENCE/FLEE/SIZE MODS so there's no boost in damage.
Yes, you'd obviously take more from forced neutral attack when stone cursed/ frozen from another player, but that's not BOOSTING, nor is it boosting in pvm on monsters since its a property change, and only really helps against ghost type monsters.