Well, Hisoka died of suffocation that time so there was very little real damage. Yea he lost some limbs and got fucked up, but no fatal blow was dealt. So all Hisoka needed to do was restart his heart and he was fine. Had he taken a fatal blow it would have killed him and his trick wouldn't have helped. Basically he bet everything on the mind controlled dudes cushioning him from the blast and him taking very little damage from it. Had he taken the full force of that blast he'd be dead for sure.
EDIT: Even now I'm not sure how much time he's got. He's using his nen just to stand up and walk around. That's got to be exhausting. Seems like he's living on borrowed time for now.
I think keeping his limbs should be similar to constantly using Gyo, but using them to stand because his nen is actually rubber. Also if we go by the early rule that humans usually just excrete nen all the time, then its not that farfetched to think that Hisoka can keep his nen under control with his texture surprise and not actually lose it.