He wasn’t stilted, he was fantastic! He pauses and reacts to crowd yelling stuff, which probably is/was not picked up by his microphone.
I thought he did ‘fantastically’, too :-)
He’s not someone who ‘learned’ this stuff - it all comes naturally with him. He knows exactly who he is, and what he believes in.
(I think that’s one of the things that some people hate about him - because they aren’t authentic people themselves.)