Yes, I kinda agree. It could be a fake one. A lot of documentaries and videos show some "exorcists" and "exorcism footage" but the truth is that, they aren't. In fact, the Catholic Church does not allow broadcasts of exorcisms. If they do allow it, the case might be an isolated one.
Supposing the video clip is a fake its not to say that it isnt a reinaction? Of course Christians will believe what is written in the bible is the truth. For those who question demon possession how can things like becoming physically strong, the ability to speak in another language - often Latin, experiencing facial changes be explained?