It's a slow-moving boat ride. Hardly something that should cause a problem -- they have a special loading area for guests with disabilities and everything.
I have been on it, I know what it is, and that doesn’t change my comment one iota. It is on water, what if he fell out and frickin drowned, he is wheelchair bound, Disney ought to point out these morons need to assume their own risk if they are getting on the ride. It ain’t a cocoon folks.