ah gotcha, its probably just the HE Nades are added as an item to be acquired from the Gift Box Drops, but since they are restricted in the ZRiot gamemode it doesnt give it to you
thats alright tho cuz the HE Nade only does a max dmg of like 90 or 110 i wanna say, so for Zeds with more than 300 health sometimes the Nades are less than effective
although it would be cool if we could add the HE Nades again and also mod them so they do 500 dmg, but there isnt a way to do so that i know of, or at least not that we could find