"I was dead---" sometimes the word clinically or medically appears here, sometimes the word literally "---for 11 minutes and I went to heaven"---sometimes saw my past/future lives, or experienced the whole of being or some such. Generally the 'experience' is culturally and religiously dependant.
Clinical death is misleading, precisely because it is not necessarily death. If you've come back to tell me what happened while you were dead, you weren't dead. Your brain yet lived.
I agree, and we don't use that terminology in my country at all. If you live afterwards you weren't dead.