Yes, I do not believe that. Moreover, the claim that someone in this world with human body and brain can nonetheless, through spiritual powers or being free of "fetters," thereby escape fully the extreme limits of what body and brain can tolerate is as absurd as the claim that there was actually a "Superman" with a chest so strong that it would stop bullets, or a conscious human being who would not eventually be broken by the torture chamber. The claim is so absurd that it demands, not just faith, but special evidence that such people exist. Granted, people can place themselves into states where they do look death square in the eye, be it the Japanese Kamikaze, the 9/11 hijackers or the Vietnamese and Tibetan monks who burn themselves. However, that does not mean that the Kamikaze etc. would be fearless and beyond break under all conditions, and I demand something more than "faith" to demonstrate that a conscious individual, even that Vietnamese monk, could be beyond the breaking point no matter the stress placed upon them in all extreme circumstances.
The one exception I might accept is that a Buddha or other mystic might develop the ability to place oneself in such a deep trance state that they are no longer conscious, i.e., the equivalent of being under full anesthesia during surgery whereby one has no sensation of what the body is experiencing. Even so, I have seen no scientific proof that such states can be attained without pharmacological assistance, even among meditators who enter very deep states for a short period.
So, I would say that the burden of proof is on those who would claim that Superman exists or that the CIA could not break a Buddha.
THAT SAID, I know this ...
Buddha is beyond all possibility of breaking or suffering in any way. It sounds like a fully contradictory claim, so let me explain:
The human, historical Buddha in India, as well as you and me, made of flesh and bone, can be broken. However, the aspect of Buddha (which is also you and me and all things) which represents the flowing wholeness of this world, emptiness, the Dharmakaya and such, all as all is, cannot be broken for this flowing whole can never be less than whole by definition. We and all things are the whole flowing, the whole is flowing as us and all things. That said, you, me and all things can sometimes be crushed and broken even as the whole flows on and on.
To the extent that Zen or other spiritual practice allows one to experience one's aspect as this flowing wholeness, one realizes that there is
an aspect or alternative
True Face of oneself that can never be crushed and broken, can never die (and was never born either). Nevertheless, this body and brain of flesh can sometimes be pushed beyond its limits and broken, is born yet sometimes grows sick and dies. If Dr. No tried to split Buddha with a laser beam like he did James Bond, the body of flesh of the Buddha would be split in two, yet Emptiness, proclaims the Diamond Sutra, is simply unbreakable.
Sorry to run long, but I hope the point is clear.
Gassho, J
STLah