> if the lie on Twitter is used to commit fraud
I'll apologize if I have the details of the case wrong, but where is this supposed fraud? The only way I could see this being fraudulent is if (1) the private investigator being PAID for his investigatory services created the account and faked the document himself to continue getting paid for additional investigation or (2) the journalist being PAID for her journalistic work created fake documents so that she could publish them and accrue the financial benefits of authoring a juicy story.
But if whysprtech is anyone else on the planet—a conspiratorial kook, a troll, or even a political operative trying to embarass people—no fraud has been committed and there is no basis for unmasking him. The people responsible for the defamation aren't random anonymous internet trolls, but publishing companies who make money purporting to report the rigorously validated truth, but are actually lazy, naive, and gullible.