"America is still a nation that [...] sent a brave young man from Ohio [pause...] to a [pause...] PLANT! You know who it is, the stars and stripes on the face of the moon, you know who it is"
He couldn't bring himself to say what the teleprompter said because he knows it's not true.
Interesting point.
Also interesting you got two almost bot-like comments.
He can clearly read the teleprompter. Why does he not just say it? And even after some people in the crowd says Neil, he skips it.