Don't the scriptures tell us to judge not according to appearance but by righteous judgment.
While I am not saying that I don't believe that facts of the testimony, it is just that the facts might be explained by an alternative explanation than the one presented.
So what is the medical definition used to defined death? You might be surprised to find out that clinical death doesn't actually have a medically established definition so the criteria one Doctor might use to consider a person death might not be the same criteria another Doctor might use.
Then the video itself only states that the person had a heart attack and their heart stopped pumping. During open heart surgery, the heart is stopped and circulation of the blood is done mechanically, so therefore are they clinically dead? Or are they what some might call a state of suspended animation?
Notice in the video they don't reference any of his other vitals such as respiratory or EEG. So does that mean that respiratory and brain functions had not been affected by the heart attack. Since brain damage begins to occur within the first couple of minutes of oxygen deprivation, that is why cpr and chest compressions are so critical until the pulse of the heart is restored.
While the video gives one impression it is also careful not to give any specific facts such as the length of time from death until the time when reanimation occurred. Was it two minutes, 20 minutes and hour? How do we know that the man the voice the Doctor heard telling him to pray for wasn't his own soul considering the passage Physician heal thyself, maybe they didn't actually do all they could have done which prompted the Doctor to return to the 'corpse' after hearing the voice the second time.
Then there is just the simple question, why would be sent back from the presence of the LORD back to the physical world that if by your own admission holds it is a fallen world that has been corrupted with lies?
The getting of treasures by a lying tongue is a vanity tossed to and fro of them that seek death.
Prov 21:6
That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive;
Eph 4:14