After all his bravado and talk about changing the system (along with Naruto), Sasuke is suddenly all about "top secret missions" and "ignorance is bliss". They really do want to erase everything from 698 and before from the story.
Yeah, you know nothing has changed when Naruto and the other kages are keeping secrets from the public just to uphold their legitimacy and power as the world's governments.
This is exactly the kind of stuff that led to the Uchiha massacre.