This is very upsetting (but see my note below): "Stanley Kubrick Filmed Fake Moon Footage"

Note: None of the interviewees in this video mention Kubrick directly (although it's implicit that his wife, Christiane, would be referring to him, though the footage). They all say "he", which tells me there's a possibility that the footage was culled from numerous sources, after which such implications could be made.

However, I am way more convinced now than I was after watching the doc Room 237 that this is indeed a possibility.