I don't think that's much of a revelation. Every time national security information falls into the hands of a news org, the government will ask them not to publish it. Sometimes appealing to them on civic grounds that it will weaken security or probably threatening legal action. The NY Times famously sat on the warrantless wiretapping story for nearly a year because they were lead to believe it could compromise ongoing investigations. Although it was never proven true, the Washington Times was accused of helping Osama bin Laden by revealing that US intelligence could track his satellite phone. In the US or UK media orgs generally has very little to fear in terms of actual punishment, but they do have to make a very real calculus over whether they're serving the public interest.