>the same Napster vs Gnutella analogy, the same celebrity email filtering idea, the same obscure FDR gold ban interest, the same weird hyphenation errors

Dunno it assumes their cypherpunk group must always discuss strictly cryptography and never discuss anything else. It could be just some off-topic ideas floating around in their community.

For me, the only solid, damning evidence would be statistical methods of text analysis like they do to prove authenticity of a literary work.