That's a user comment, which anyone can type. Many of the other user comments just point to the film being a mockumentary, a satire (and apparently a pretty good one which I wanna see now). Can you find anyone authoritative (i.e. anyone worth trusting) who thinks the landing was a fake?
And as for the dearth of photos and documents - honestly, nobody cares about the moon anymore. Nowadays we all realize the huge cost and immense distances involved in sending even an unmanned probe into space, and nobody thinks there is anything interesting or useful up there that is within our reach. We've already been to the moon and Mars is just too far away. The people who are really the most interested in the old moon landing idea are just going to be, well, conspiracy theorists.