Because, as you say, it's obvious - the code number communicates the political opinion that censorship is wrong, or at least a dangerous tool whose use should b

Because, as you say, it's obvious - the code number communicates the political opinion that censorship is wrong, or at least a dangerous tool whose use should be highlighted wherever it occurs. People who hold the reverse opinion that censorship is just fine and authorities should feel free to make casual use of it whenever in their sole judgment there is justification for doing so, probably aren't going to be convinced by appending an argument to this announcement.