I recommend you watch the film American Moon, where dozens of contradictions about the Apollo missions are meticulously exposed; I don't say with certainty that they didn't go, I give it as a concrete possibility. In my opinion they only landed robotic probes and automated rovers, whose tracks can be seen taken from the lunar satellites, while the astronauts would have been parked in Earth orbit at most. And in any case, even if they had landed, there is sufficient evidence to indicate that part of the photo/video footage must have been produced on the ground, for various logistical and technical feasibility reasons.
Weirdly, in the aforementioned film, what in my opinion is the most powerful indication of a cheat is missing, namely the too low height of the leaps on the surface, and in any case the inconsistency of the extension of these leaps between the different shots.
The two-year delay you mention is too little in my opinion, because originally the scheduled date for a landing was 2020; and in fact Artemis 1 has been 6 years late since 2016, making it easy for the landing time to extend beyond 6 years. The mere fact that space-x is involved as an essential piece of the mission makes a further delay almost a certainty for me, because Elon Musk's entire character is built on cheating in my opinion.
On the question of the organization of the scam, the answer is simple, because the almost total majority of the companies and workers involved would have carried out their work without knowing anything, in watertight compartments, and only the directors, with strictly military support staff , would have taken control of the missions, in separated locations, whose manipulated data streams would then have been transmitted to the official channels; this is also talked about in the film I mentioned.
After all, there are various examples of conspiracies of this type, just think of the Volkswagen diesel engine scandal, which only a handful of managers knew about, while the workers and technicians involved in the design, production, control and repair chain had no knowledge; it was enough to take control of the measuring equipment to falsify the results without the knowledge of anyone around the world.