Let the man talk about his daughter! He's a proud father!

Also, woof, so if all the juicy stuff we've read isn't a state secret, what else is lying in store???

Expertly played by the Purple Knight.
Absolutely the way to handle that situation.

The salvation of this world will be found only in joy and laughter, we need all the clowns we can get.

A sincere and truthful explanation no one would belive

Best response to having someone pointing a finger into your face is still the "Matter Eater lad" response.
AKA "Chomp"

The thing is, our Purple Knight doesn't have any State Secrets to share. Everything is technically public information, it's just that some important people don't actually want their past actions talked about.

Being the Purple Knight, its quite plausible he knows any number of state secrets.
He likely just also know a lot of regular secrets and juice gossip.