All who came back from NDE did not die. If those billions and billions of dead woke up in some other dimension, it is even more crowded than this one. They will certainly continue torturing and killing each other, and fail? This will be true hell living like that without death exit. Or they can die again and fall through to the next plane, on and on ad infinitum? This is utter nonsense.
Life is one continuous process for the whole Universe. We are at the edge of this process, here and now, participating in Creation first hand. This epoch is about computers and AI. Individuals die and are born all the time to see the process from a fresh perspective. But it is ONE process. Separate bodies is an illusion to make it fun, competitive and efficient.