I tried multiplpê time to make that mod work when the boss had elemental resist so I could not use corrosive round, but each time it didn't seems to have any effect.
First I tried to use it to clear SHa'Hala projectile, but didn't work so I assume it was because it was projectil and not enemy, and now I hit Venom with the mod, and I didn't see anything happen. No damage, no debuff.