I don't know the details of this. But I want to emphasise that a lot of disabled people may need to use wheelchairs for most movement, yet still be capable of standing. I hate that people automatically assumed he was a fraudster.
According the article, he specifically claimed he was "paralyzed", which precludes any sort of standing up, unless there's some huge gap in my definitions.
You're right, but after asking if everyone watching the feed was gone, he stood up and then walked off camera.
Occam's Razor would suggest that the wheelchair was just there for effect, since he apparently could just as well have walked in and sat down in it, but decided to wheel in.
He does seem to have a weird curvature in the back, but why would he point the camera away after a few seconds? Exaggerating a disability for profit is just as wrong.