I have to wonder what the real purpose of this demonstration is? If it is simply to demonstrate a mastery of yoga and meditation, then some degree of ego attachment appears evident, which would seem incongruent with this level of physical skill and spiritual development, and thus unlikely, IMO.
Some may say that this extended state of suspended animation in deep meditation reflects the achievement of Nirvikalpa Samadhi, a meditative state of spiritual ecstasy totally absorbed in the Divine, at One with God, beyond form and without change over a period of time, Absolute Divine Consciousness. Typically, however, this meditative state usually lasts only 21 days, although some have extended it to 40 days or longer, after which there is no return to lower states of normal consciousness, and the body is then freely and finally abandoned in Complete Enlightenment.
As such, an argument could be made that an extended meditative trance of several years doesn't represent a Nirvikalpa Samadhi trance, but instead indicates a Sahaja Samadhi trance in which one remains in the primal, pure, natural state without effort, while simultaneously retaining full possession of a human body and faculties.
In any case, why would one who has conquered the duality of spirit and matter in becoming totally absorbed in Divine Spirit wish to maintain a physical body? In the past, some advanced spiritual aspirants like my own Guru, the late Swami Narayanananda, have chosen to consciously remain in their body for some time out of compassion for mankind, to guide and instruct others even after achieving Nirvikalpa Samadhi. In the case of this young man, however, no direct teaching or spiritual guidance is likely as long as he remains in this meditative state of suspended animation with no movement, no eating, no drinking, no waste elimination, no talking, no conscious engagement with others of any kind.
So again, I question how sitting for so long benefits either himself or anyone else?
Doc