Then add the negative space. Back was one of the most prolific voices on these lists for a decade, especially on digital cash. Satoshi shows up, Back goes quiet. Satoshi leaves, Back comes back. Hardy and Littlewood never had that problem.
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.
That could be a valid methodology if you pre-registered the list of quirks before doing the investigation.
But in this case the journalist clearly didn't do that, but tweaked the set of quirks until they produced the desired outcome.