I will just say that I have my doubts.
Person death occurs before death of individual cells, which is why it is possible to resuscitate people after their heart or breathing stops. However, cells begin to die soon after person death, and once cells die, there is no bringing them back. The process of rigor mortis is a sign of cell death, where the motor proteins become locked after the cell depletes its energy. Brain cells use more energy than other cells, so they use up their stores very quickly and die within minutes.
I have taken a few courses in first aid, and they always teach the brain starts dying after 4 minutes.
Sometimes in very cold places or under cold water as long as 30 minutes , but bringing back the brain dead doesn’t sound too bright to me.