to an extent yes this is the kind of things you shouldn't be talking about...
If you deduce something (100%, 50% whatever) about someone's role that the baddies overlooked, but pick up on, it helps them far more than it helps the goodies.
edit:
assuming blablah is one of the goodie actions that isn't in the night post is safe though. Just like araver isn't one of the roles that acts tomorrow night