NASA did indeed supply information to Stanley Kubrick, at Kubrick's request, because he was making a generation-defining space epic. A lot of it was photography from uncrewed probes to the Moon, so that Kubrick could get his visual effects right. That's perfectly natural. The notion that it was for Kubrick to fake the Apollo photography is pure imagination—an early internet joke that some people took all too seriously.
Weaver had a very fertile imagination, which he has a hard time keeping separate from fact. And yes, Weaver has been giving all this a lot of thought: he was obsessed with the notion of a hoaxed Apollo for probably close to thirty years. He kept writing and rewriting the same nonfiction book filled with imaginative theories he couldn't be bothered to prove, hoping it would make him famous. It didn't, so finally he had to turn all that imaginative energy toward writing the story as a novel where he could just make up whatever he wanted without fear of informed criticism. His greatest imagination was believing that all those years running a software company would give him a foundation of understanding sufficient to tell his betters what frauds he thinks they are.
If you didn't wear your bias so prominently on your sleeve you could almost be taken seriously.