I just rewatched the tape and he appears to be tied up and all you see are the arms of a chair (you can't actually see wheels of a wheelchair, but then again, the camera does not pan down quite low enough to actually "rule out" wheels being there...and remember that this is "LOST", so this type of angle is likely intentional). But yes, until we can see more in a future episode, it would appear that he is just tied to a regular, garden variety chair with arms.
