In my experience, HBs don't understand how history works any more than they understand how anything else works. You can tell based on all the weight they place on Nixon.
Was Watergate a scandal and a Constitutional crisis? You bet. Does it show a disregard to the truth and the law in Nixon? Absolutely. Does it prove that Nixon lied about everything? Absolutely not. Nixon is a complicated figure, even a tragic one in some ways. He had a strange sense of honour that was completely overwhelmed by his need to be liked. I would argue that you can track everything Nixon did wrong in his life to a need to believe that people liked him. More to the point, though, it's obvious that he didn't lie about everything. We have evidence of all kinds of things he didn't lie about. He didn't lie about the automatic cost of living adjustment to Social Security; all you need to prove that's true is to note that Social Security payments still get automatic COLA to this day.
So if you're going to put "Nixon lied about stuff" in your evidence column, well, that's not enough. Everyone lies about stuff. Everyone also tells the truth about stuff. So you then have to work out if it's more likely, in this case, that Nixon was lying or telling the truth. Given that Apollo was announced by JFK and pushed by LBJ, it frankly becomes more likely that Nixon was telling the truth, and if you don't understand why that's the case, you need to stop using Nixon in your evidence column anyway, because you don't understand Nixon. Revealing the hoax would have, in his eyes, made him beloved at the expense of JFK, who had once betrayed him. I mean, come on!