Here's why the filmmaker is being cagey, as near as I can tell:
In order to actually produce a true "Dark Dungeons" movie — something that gamers around the world have heard of — he had to get Jack Chick's permission. Yes, he could do a true parody, but then he'd be opening himself to lawsuit from the Chick folks.
Additionally, though, he's a gamer, one who knows the whole "Dark Dungeons" thing is utter BS. He knows, like all of we gamers do, that the DD tract manages to parody itself in its absurd sincerity. By writing a script that not only includes all of that but even takes it further (Cthuhlu is real, etc.), he keeps the Chick folks happy while making it even more obvious to the rest of us how absurd it is.
If he says, "no, this is serious, I believe that RPGs are dangerous" to appease the Chick people, he'll drive off his actual intended audience, gamers. If he says, "this is a parody, of course, this stuff is completely nutty" then he loses the Chick permission.
By not taking a stance he can more-or-less satisfy both crowds: Chick thinks he's serious and he assumes we'll have the insight to recognize that he's totally making fun of it.