That ending is... A lot disappointing. I feel like it was build-up with no real closure, which always leaves me frustrated. On the plus side, it doesn't seem like the "lol they were filming" is supposed to have actually been the premise of the series and was moreso just a "thing to do with the afterword page" (considering their "here's what I think happened" comment) but still... If they weren't going to dedicate a chapter to resolution of the story, I feel like they could have told some of the resolution through snapshot images in the afterword.
Either way, I really really loved this series and while the ending leaves me wanting (not in a good way), I enjoyed reading it.