Is he a true vegan?

There is no such thing as a true vegan as you don't get your membership revoked if you do something different than another "vegan". Some vegans will not eat almonds (for example) because they exploit bees in the process of growing them in many places.

But generally no, vegans eat a normal amount Some eat less than others and some eat more.

Just remember that vegan doesn't mean healthy. Oreos are vegan, but I don't know anyone who thinks that Oreos are healthy.

Your friend sounds like the type of vegan that gives most vegans a bad reputation for being annoying.

Green 666 by isotope rays is NOT forgivable; it leads to permanent hell. 666 is given with World Passport with no name on it (greyplasticcard). Police 666 people on highways. Food stores and prisoners/insane asylum folks (released by the antichrist) 666 people too. Reject vaccines. Don't go into UFO to be healed by demons. Hide with OrthodoxChristians to escape 666; leave all electronics behind so that antichrist's minions can't track you; burn documents as documents are from Satan.

If he says he is vegan there really is no reason to doubt him, but there are people who just do not derive any pleasure from eating ANYTHING, much less any specific type of food, and he might be that kind of person. 

If that's a true story, it sounds like an attempt to go "breatharian". Let's call it what it is: starvation. Someone like that is nuts, and should be put on suicide watch in a mental institution.

A vegan is a strict vegetarian who only eats fruits and vegetables - unless they eat processed vegan imitation foods. Someone who doesn't eat anything at all is not even a vegan. They are starving themselves, and they're going to die. If the individual in question is only pretending to never eat, but eats food in secret when no one is looking, then he's a liar.

If he consumes no meat or animal products at all he's vegan.

Why are you concerned about it?

I am here as a vegan, i was born to be a vegan, and yes he is a true vegan

Per Wiki "Veganism is the practice of abstaining from the use of animal products, particularly in diet, and an associated philosophy that rejects the commodity status of animals." How much one eats has nothing to do with being vegan, vegetarian, fruitarian, or a meat-eater. He's simply a person who doesn't eat a lot, who also happens to be vegan.