The main substance of the linked piece is an interview with Sam Parnia, who practices resuscitation medicine. Below is a quote from the interview.
It takes time for cells to die after they’re deprived of oxygen. It doesn’t happen instantly. We have a longer period of time than people perceive. We know now that when you become a corpse, when the doctor declares you dead, there’s still a possibility, from a biological and medical perspective, of death being reversed. – Sam Parnia
In Buddhist traditions it is widely believed that consciousness stays with or near the body long after the point in time that standard Western medicine says this is not possible.