There were a few moments in there where I thought the argument they were using to debunk something was weak, but there were more than enough solid arguments to convince me that the manned Apollo landings were faked. I only actually made it about 2 hours in before I was convinced enough so I don't think I made it to the part you mentioned.
This is how they describe this section:
"Let's now tackle the most important issue in the entire discussion on the lunar pictures: backlight photography."
So the "most important issue" is a fail for them. And it highlights the problem with the entire documentary: it sounds convincing, until you dig deeper. The film consists of photographers spitballing, saying, "Doesn't look right to me", while ignoring alternative explanations.
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