To your latter point I did actually two tests with my girlfriend: I asked her to respond "as I would" rather than with what she thought the truth was, and then did another test where I just asked her to say what she thought. She improved when I told her to predict what she thought I would say—and that's the data I used in the article. But she was still significantly worse than the best GPT model
Re the information: I don't think so. The version of GPT that had access to only my most recent tweets performed better than she did, and she reads all of my tweets. In general, I think she has much higher fidelity data on me as an individual than GPT does.