Covid's Airborne Danger had been hidden by Trump and Journalist for 7 months

Before Feb 7th, President Trump received intelligence or translation from publication by Chinese government that the covid19 was probably airborne. He told journalist Bob Woodward through hotline. The first leak of this news, however, was in Bob's book published on September. On Sep 10th, Trump defended himself that neither did Bob publish that news to the American public. Bob Woodward was obviously pro-democrats. And why is the tacit between them? Were they both commanded by a bigger authority?