You have forbidden Gojo to fight Sukuna, but Gojo still goes to fight, and says "don't worry,i will win." After that you waited for Gojo at home,You see the news on TV and then suddenly you saw Gojo's body split. His body was lying on the ground, and another one was standing. He lost to Sukuna. You go to the location and see Gojo's body is lifeless,Gojo is dead