I don't know. I haven't seen the film, but your description coupled with this interview makes me think even more that it's a hoax. To what end, I don't know. His responses to the questions are too vague to be real, a real person intending to be vague would still give away more specific details than are found in this interview.

I know, it's definitely strange. But it's my understanding that the director (whose name isn't really Mark Region) speaks English as a second language, which makes sense...

Mark Region is a fake name? I knew it.