It's simple, the government, or deep state, doesn't need to prove or disprove anything. They're the ones with all the cards (top secret intelligence), there are no new revelations here.

There exist several Podesta emails in regards to UFOs but of little significance, aside from reiterating his desire for disclosure.

https://wikileaks.org/podesta-emails/emailid/52054

https://wikileaks.org/podesta-emails/emailid/46961

https://wikileaks.org/podesta-emails/emailid/51429

https://wikileaks.org/podesta-emails/emailid/50894

Conversely, there are numerous emails with odd references to 'pizza', 'pasta' and 'hot dogs' that appear to be used as code words. There are even more instances of media collusion, pay to play, Bernie sabotage, etc.