It's more of a horror series than a creepypasta/ARG.
In fact, the term creepypasta is widely misused. It's more intended to be something short you just copy and paste in order to give someone a spook. As opposed to a copypasta which is generally used for humor or silly threats that people sometimes take seriously.
For example, the navy seals thing is a copypasta. For comparison, man door hand hook car door is a creepypasta.
As for the authenticity. It's really well done, but it's definitely not done through a playstation in any form. Not that I have any doubts that it could be done that way, it just seems to be unnecessary effort when you could just pretend it is.
Poll