Your caution about the word “possible” doing too much work is exactly right, and that discipline is more valuable than either the dismissive or the credulous response. What the Borjigin study shows is a correlation — a surge of organized neural activity at the moment of death. It does not prove consciousness persists. It proves that something organized is still happening in the brain for a brief window after the heart stops.
The Tibetan Book of the Dead (Bardo Thodol) describes a specific sequence of experiences in the post-mortem interval: first the clear light, then the peaceful and wrathful deities, then the pull toward rebirth. What is remarkable is that this sequence — developed through centuries of contemplative investigation, not empirical measurement — roughly maps onto what neuroscience would predict if consciousness were gradually losing its tether to sensory processing. First the most fundamental awareness, then the more complex constructed experiences, then the dissolution.
The Dalai Lama has explicitly said that if neuroscience ever conclusively disproved a Buddhist teaching, Buddhism would have to change. The bardo teachings are not dogma — they are reports from the field, based on generations of meditators who trained themselves to observe the mind’s behavior at the edges of consciousness.
The Death card in tarot functions similarly — not about literal dying, but about the archetypal pattern of dissolution and transition. The gamma surge might be the brain’s version of that same pattern: one final, organized flicker before the system goes dark. Whether that flicker is meaningful in the way the bardo describes is, as you say, still in the realm of “suggestive.” And that is a perfectly honest place to be.