As I said I am not going to speculate on this man’s vision.
However, you still don’t seem to get what I am saying. “Clearly, the brain does not stop working, and the person is not dead.” Define dead. There are no vital signs - no blood pressure, heart rate, etc. The body temp is 17 degrees Celsius. EEGs are done that show total supression of brain waves & activity. I’m not sure why you feel the brain hasn’t stopped working. We supress it to where we cannot detect activity with a bispectral index. Could the patient be dreaming? I’d say unlikely; but your assertion that they’re not “dead” is pretty much of a stretch. You have no idea what went on during this man’s surgery.
Yes, that's why people can report events that occurred in the operating room while their circulation was stopped.
Could the patient be dreaming? I’d say unlikely.
On the contrary, very likely based on the research I did after your post. Hallucinations, some religious some not, are common (except in cases where the person doesn't remember anything at all or has reported events as they unfolded in the operating room).