Why do they still write this ? NHL salaries are public.
Because he can sign his name on a piece of paper, but nothing is confirmed until those papers are sent to the league, and then approval is given. In case you didn't know, the league reviews salaries and contracts to make sure they conform to guidelines involving structure, length, cap issues, etc.
So yeah, the Habs offered something, and A.Kost signed... that's all we know right now, and that's all anyone can tell us at this point. Once the league puts the rubber stamp to it, the salary becomes official and then is released to the public.