No super dmz is a steroid. They are not legal just because they're prohormones, they're legal because that particular substance is not explicitly written on the banned list. If it's not on the list it can be sold.
Prohormone converts to a steroid, a steroid... well is a steroid lol. Most of the things on the market actually are steroids, there are pretty few actual prohormones around right now.