No countries will permit such stupidity. Using it won't be much different than indiscriminately blasting a shotgun behind you (dangerous jet will also pick up road debris and blast it everywhere). It will be like nitrous for closed-course only and if they catch you with the tanks full, they will 172 you and take the car.
In practice, that car was gutted, had no driver and almost certainly had a tiny battery. Like most of his promises, by the time this goes to production, it will be closer the Mercedes bounce or maybe the chinese ev that can "jump" by lifting suspension quickly. Those systems could get approved as they aren't stupid and dangerous. Hell, his steer and brake by wire in this car is enough to keep it out of most world markets.