"After all, as one of the most famous writers in the
world today, you are a legitimate subject for inquiry,
whether you welcome it or not."
Either I am completely out of touch, or this statement is not true.It's probably the former. One of the mentioned novels titles sounds vaguely familiar, but I have never ever heard of Elena Ferrante.
I only read this letter because I wondered why an open letter to someone I'd never heard of was posted to HN.
* [edit] Having said that, I completely agree with and respect her right to remain anonymous, whether she is influential through her writing or not. I also completely agree with the assertion that a book, or indeed any work of art or performance, exists totally independently of it's author once published or performed.