I think the author made a mistake. The first case (but bottom left square of the table) is this scenario (Keep Torturing, No Hidden Volume):

  If you don't have a hidden volume and the government decides to keep torturing you, 
  you're screwed. You have no way of stopping the torture even if you wanted to, and you
  probably get killed. So your reward is -100. The government's reward is 10 because 
  although they may have wasted some time torturing you, they have your plans, can prove
  your guilt, and arrest your accomplices.

I don't understand why the government's reward is 10. How do "they have your plans" if there is no hidden volume? Are the plans in the "outer" partition in this scenario?