This is absolute nonsense. Have you watched the whole press conference, or even read the transcript? They confirm any number of times the full details of how they got to the moon and walked on it. If you are just talking about the single question, then they are explicit about not seeing stars from the surface without optics, but also explicit in that statement is that they were on the surface. Do you expect them to preface every answer with 'Well, when we were on the moon, which we totally were, honestly...' ?
If you want to live in the fantastical belief that none of the Apollo 11 crew ever stated explicitly that they had been on the moon, then you are....well, deluded I guess.
As to body language - you have no idea how the first man on the moon should react. Nor does anyone. He was first. They don't fit into some nice little pidgeonhole you have for them because they were exceptional. The best of the best. They don't react like most people because they're not most people. NASA were not in the habit of sending ordinary people to the moon. They were, by definition, exceptional. I'm not saying they were supermen, but they lived in a working environment that you don't seem to be able to comprehend. Where any number of decisions were a matter of life or death. Doing it right was not just a vague aim - it was an absolute requirement. So no, they don't get all giddy talking to the press, they do their job.