I'm sure he could survive for a day after enough training... 10 days, getting a lot less likely. And indefinitely... absolutely no chance.

The fact is, whereas dedicated individuals can push themselves to all levels of endurance there are fundamental biological factors that can't be overcome. Plants can make better use of sunlight than us but even they require nutrients from the soil along with the air.

Plenty of Yogi's and their entourage have been called out as complete charlatans before. If he submits himself to the same test in a lab outside his own community / country and the same results can be replicated then I'd be happy to change my mind.