At liberty to elaborate always sounded like a weird phrase to me. Of course he is. As a free citizen in a free society he can speak his mind freely.
Basically it seems kind of silly to tightly define it as "going to jail", when the practical aspects of willfully violating an NDA can ruin your life (which may or may not be worse than going to jail depending on circumstances)
It was specifically referred to as your "liberty" which is incorrect. I never argued that violating an NDA could or could not result in something worse than jail time.
(For that matter, even prisoners have some liberties...)