Can I dismiss it now?
Yes, now that you have actual evidence that shows that the documentary is a phony, yes you can.
No, because you still haven't watched it yourself. Remember that's written by someone with a biased opinion, you can't judge it no matter what anyone else says because you still haven't viewed it.
A trusted source of information has claimed, with cited sources, that the documentary is a phony. You can't say "It's not invalid unless you watch it yourself." That's like saying "Unless you read Darwin's book on the theory of evolution, you can't say it's true!"