It's very likely that it's fake. It's very difficult to survive in the desert for twelve days, even if you have adequate water, let alone survive and find the energy to build a motorcycle, as rudimentary as this one might be.
Finally, in a few of the pictures the supposed engineer of this contraption is shown in a thong. I don't know about you, but if I were in an arid place the last thing I would want is my skin exposed to sun and the air.
It may be a real motorcycle, and that's cool, but it's very unlikely it was built under the conditions discussed in this article.
"It's very difficult to survive in the desert for twelve days..."
My co-founder survived in the Desert for 52 days after crossing the Gobi Desert entirely on foot in 2011. Not all deserts are 50C every day and explorers can be quite hardy. Also, they often wear clothes to cover all extremities, including gloves to cover fingers.
Deserts don't get much rain, but they still have rivers. Some rivers are seasonal[1], others permanent, and all you need is some chlorine tablets and you have a decent supply of water if one is nearby.
Also, if he was concerned about theft by the locals, that means that there were other people around from whom he could have obtained water and food.
EDIT: It seems that this did happen right next to a river [2]
