Simple, really; he cannot. But then again with the release of the book 'Fear' his little 'resistance' movement was probably going to be coming to an abrupt end anyway; and so it was time to either quit or actually become a Trump team player OR create a golden career parachute BY coordinating with the release of the book with the NYT so that no matter what he or she is probably going to be financially secure and have leftist career options in the media industry. Thus the release of the article was timed with the release of the book because the 'insider' figured that the game was just about up anyway. Trump and company will be scrutinizing everyone now with an eye toward reviewing how items and issues are handled. The insider will either be discovered or things will tighten up to the extent that the resistance activities will be shut down anyway.