> Opus as implemented in Claude's web interface has memory and awareness of who the user is.

Kelsey knows this:

To make sure it wasn’t somehow feeding my account information to Claude even in Incognito Mode, I asked a friend to run these tests on his computer, and he received the same result; I also got the same result when I tested it through the API.

When I tested this with my own writing several LessWrong commenters tested it with the snippets I provided (see comments) and saw that it could identify me: https://www.jefftk.com/p/automated-deanonymization-is-here

You should check out some of the other comments where works of others were also tested, and all were correctly identified. Like https://news.ycombinator.com/item?id=47970219

Several others have reproduced this for Kelsey, and she's certainly not technologically illiterate.

She says she has memory disabled. I don’t think Kelsey is technologically illiterate.