Your source, Allen, is a scam artist. His book was published by a fringe publishing house that has ZERO independent vetting of the content in any off its books. You have jumped in [bed] with a source that sits on the same shelves and bigfoot, fairies, psychics, aliens, ancient aliens, alternative medicine, and ghosties. You can't seriously expect any reasonable person to take Allen's arguments seriously, let alone face value. His claims in his book have been destroyed to badly that Hiroshima feels sorry for him.
Reputation matters. It's that simple. Marcus Allen earned himself a reputation as a teller of tall tales for profit. Specifically, he was proven wrong on points he should have known. When that happens, and repentance is not forthcoming, then Allen loses his authority. Thereafter when someone says, "According to Marcus Allen..." that carries little weight or credibility. And no, assessing the reliability and credibility of people cited as authorities in support of a claim is not a distraction, not an
ad hominem argument, and not a departure from the facts.
Yes, Marcus Allen was a professional photographer for a while. But when he says, "As a professional photographer I expect to see stars in Apollo photos," he shoots himself in the foot. Legions of
other professional photographers (and loads of knowledgeable amateurs) can prove that the expectation is factually wrong. It's not a matter of differing expert judgment. Photographic exposure is ruthlessly mathematical. It's a matter of Allen flat-out
lying under color of expertise. What he's claiming is contradicted by easily discovered, easily proven, easily demonstrated fact. No amount of expertise makes those facts go away.
Allen and his co-author Trevor Weaver ask you to trust them when they teach you things about the Apollo record and the relevant scientific and historical principles. But they lie. They omit pertinent information. They lie about what the evidence objectively shows. And when the lie, they lose the privilege of being cited seriously as authorities. They earned a reputation as dishonest peddlers of falsehoods and half-truths. That matters.
We don't need Allen and Weaver to tell us that a selenostationary orbit falls outside the Moon's Hill Sphere and as such is not physical possible. That's a fact that exists independent of them. But when they weave a fanciful tale based on their omission of pertinent evidence and their ignorance of what the evidence shows, they purport to teach the reader something they think the reader will not already know. And having taught them that thing—a nugget or two of truth wrapped in layers of ignorance, assumption, and nonsense—they can lead the reader to the desired conclusion.
Because this is their reputation in the real world, "According to Allen and Weaver..." does not instill faith that the principles about to be discussed will be the whole truth or an accurate depiction of the available facts. It is not wise to take something at face value on their authority. The conscientious researcher will have learned that their claims need fact-checking. If the claimant wishing to establish something on Allen and Weaver's authority is unwilling to do that fact-checking on their own, then they are likely to face it from someone else who is better informed and more conscientious than the claimant.