The delegitimizing of real news sources (like CNN) and even of the term "fake news" is just part of an overall pattern of Trump weakening American democracy. Add to that, suggesting that the election might be rigged and undermining the credibility of the intelligence community.
Next I predict you will see him undermining the credibility of congress (although that's not hard) and/or the courts.
What's left? Trump's executive branch.
Here's the facts:
1. The existence of this dossier is news
2. The fact that the president and president-elect was briefed on it is news
3. The fact that buzzfeed published it was news
4. The fact that the CIA might be behind the leak about the existence of this dossier is scary. A war between the executive branch and the intelligence community.
5. If any part of this dossier is true (probably not), and if his actions have been influenced by the risk that it might be released, then Trump is guilty of treason.