I think we must have read two different speeches, because the one I read was Moxie stating that the invention of Signal was an inevitability, not him taking credit for it. But then it kind of sounds like you have an axe to grind on this topic?
The Levchin Award recipients are determined by the RWC Steering Committee, which this year was Dan Boneh, Aggelos Kiayias, Brian LaMacchia, Kenny Paterson, Tom Ristenpart, Tom Shrimpton, and Nigel Smart.
I think we can safely assume Moxie's popularity on HN had very little to do with persuading these people.