Right, but her experiments with friends' prose also show it picking up on them being "in her orbit".

So it's not just a person developing a distinctive voice and not being able to "turn it off".

Some tens of years ago I used to hang around on an online forum related punk, hc, heavy metal etc. music, and it had a recurring problem of quite unsavoury individuals coming there to spout racism, nazi-ideology etc. They of course got banned, but returned with a new account trying to ” lay low” and be more indirect in their rhetoric. However even this did not work because the admin of the forum had unbelievable nack to recognise people based on their style of writing.

Web has never been as anonymous as people think and this writer seems to have a clear confusion what it really means to be anonymous and hide your identity. Really, having a distinct writerly voice and being a published writer is pretty much the same as leaving your finger prints on the axe.

It appears to largely be able to identify people who are prolific public writers. I just asked it to identify a whole bunch of comments I've made on private Discord servers and it said it couldn't for all of them, even when they had details that would identify me uniquely to anyone who knows me well enough (work locations, city I live in, wife's employer, my employer).

All the people it seems to be identifying are bloggers, journalists, and/or published authors.