I watched the video. A discussion on this topic requires understanding the following post:
“Near-Death Experiences (NDE): Brain Is Not the Mind“
The following need to be considered:
- Per Buddha Dhamma, thoughts (citta) arise in the mental body (manomaya kaya or gandhabba), not in the brain.
- The brain is a billion times slower than the mind (cittas originate in hadaya vatthu in the manomaya kaya).
- The “relativistic effects” may affect the brain but not the mind.
You may want to read the links in the post to get a decent idea of the above concepts.