It's obviously intended for the viewer to believe that Piper's house is being haunted by Owen Hart.
Having said that, trying to convince people to believe in ghosts is a lot like trying to convince people to believe in God. If a person is convinced that there are no ghosts and they've never had an experience that convinced them otherwise or even made them wonder, then you're never going to do it. But, if a person has had an experience that makes them believe in ghosts, you're never going to convince them they're wrong.
It's obvious from the video that Piper believes his house is haunted (I mean, he was on an episode of "Celebrity Ghost Stories" for Pete's sake), but I would question whether or not the psychic in the video had foreknowledge of Piper's relationship with Owen (I mean, it's such obscure knowledge). Now, whether or not she knows about the relationship going into this visit and whether or not she is actually feeling the spirit of Owen Hart, that goes to belief, not evidence.
wk