If I understand typical agreements, nothing is stated publicly unless a piece of paper is signed by both parties to the agreement containing the terms.
Once signed it is a legal document.
If the agreement consisted just of a verbal discussion between two officers, or even the whole DofD of both companies, they would not be allowed to publicize it because it would not be fact.
Companies have been suspended from trading for publicizing rumours or opinions ( i.e. non facts ).