From me reading the abstract, doesn't seem like it. But I haven't read the paper, and don't know what "phenomenological similarity" is either.
It would be cool to think that we could trick our brains to do that on demand, without having to experience a near death situation!
I can already imagine the headlines, "Shamans hate him! Learn this one trick how you can too..."
"Oh sh*t, that was traumatic. I'll never eat these gorgeous little berries if they caused that".
On the other hand... "maybe if I take just a bit less, I won't almost die but just have a great trip". Hence, psychedelics.
https://science.howstuffworks.com/life/evolution/stoned-ape-...
It is just a side effect of some other mechanism that likely has a use during our lifetime.
Until we can run control variables over billions of years…
If your heart stops, oxygen is going down, it could just mean that your brain regularitory features stop working as designed and it's firering more random.
More random / lsd / drugs can give you weird effects. Optical, sensorical etc. illusions.