Apple should change their name to "Peeping Tim".
Doubly bad, because the actual post is about how Apple doesn't actually do the "tracks your every use of an app" peeping they original post that made all the fuss says they do.
I too am not happy about the root snapshot thing...
What's being signed is a hash of all the individual file hashes, so any file being different from stock will mean a difference, whether it was changed in the latest update or not.