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OpenAI now tries to hide that ChatGPT was trained on copyrighted books, including J.K. Rowling's Harry Potter series
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
There is enough non-copywrited Harry Potter fan fiction out there that it would not need to be trained on the actual books to know all the characters. While I agree they are full of shit, your anecdote proves nothing.
Why? Because you say so?
He brings up a valid point, it seems transformative.
The anecdote proves nothing because the model could potentially have known of the McGonagal character without ever being trained on the books, since that character appears in a lot of fan fiction. So their point is invalid and their anecdote proves nothing.