Try to find one reference to him being in an accident or in a wheelchair that is not related to this Delta story.
If true, you would think it would be all over his work, about how he has overcome it or it made him stronger, or some other crap.
MotionMan
There is one writeup in one of his foundation newsletters talking about the motorcycle accident, continuing spinal cord problems and upcoming surgery, dated a month prior to the flight.
Bad backs can be things that are sporadic. And some people have this pride thing going where they see it as a personal weakness and must never let it be shown. I don't know, my father has always had a bad back and every 6 months goes through a week where he can barely walk. Once I was around when his back went completely out, he's laying on the floor cannot stand up, can barely move his legs, I try to help him, and all he does while lying on the floor is smile and say "No, I'm fine, really, I feel good, no need to do anything for me, I'm good!"
Some people just go to great lengths to hide personal injuries. The story of this guy sounds plausible, but it was absolute shit 3rd rate journalism on the Huffington Post writer, writing what he believed the story to be instead of finding out what the story actually is.
Personally, this guy is probably absolutely miserable to be around when he's not "on", my gut says if the story is true, people didn't want to help him because he pissed them all off during the flight. Nobody is that much into love and peace and spirituality and goodness and all that without having a counter-side to themselves that they are making up for.