William Bramley's book 'The Gods of Eden' (1990).
A foundational text for the ancient-astronaut and 'hidden custodians' school of conspiracy thinking.
It's the primary source that the writer Swindoll Jr. cites for his 'they are not human' framing, and the engine treats it as a genre-defining, all-encompassing conspiracy synthesis.
It matters as a root document that later omni-conspiracy theories build on. The entry is short, so this is the extent of the claim.