>> news organizations were concerned that signing the rules conveyed agreement with them, including to a restriction that they not report on any news — even if unclassified — without official approval

Where in the memo does it restrict journalists from reporting on any news without official approval? Can you quote me the relevant section?

I see a section about "unauthorized disclosure of CNSI or CUI", but CNSI and CUI are specific classifications of information that the government is required by law to protect.