Blackmail, where's the money?
1. Extortion of money or something else of value from a person by the threat of exposing a criminal act or discreditable information.
2. Something of value extorted in this manner.
I don't see a mention of money, to be blackmail, where is the money for it to be blackmail? I think the blackmail part is a red herring.
HOWEVER, read the detail, he points out that the likely person leaking her info is an employee of the company she is associated with, and also a claimed letter to press revealing the confidential info. Fact 6.
So the second reason (likely breach of professional duty to privacy) is the likely reason he ruled that way. I also think he's right. Confidential info has been revealed, even sent to the press, the IP address likely points to the discloser. If the info was really criminal then it would have gone to the police not the press. Hence not a whistleblower in need of protection, more a pain in the ass with a chip on her shoulder (and it will be a she).