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I did simplify the whole thing, as you noticed; but note that his SIL and brother identifying him is another example of the same process, David knew that expressions that Ted used like "cool-headed logicians" were highly unusual, not too unlike what the socio- and forensic linguists did there.

But if the author does not have a large body of writing that is known to come from that individual

Such as a Lemmy or Facebook account? Or any other online account associated with your writing, really; we produce far more text in the internet than ourselves realise.

And while a priori, your different accounts through different websites might look completely disconnected, as you connect two of them as coming from the same person, connecting a third one is easier. And a fourth. So goes on.

A small caveat is that while the corpus is bigger, so is the noise introduced by people from the other side of the world that happen to use the same patterns as the person whom you want to identify. Even then, I believe that the ability to bulk process text to find authorship grew considerably faster than the number of potential matches.