In this specific situation, it's not really a case of using an LLM to replace real interaction. No real person set out to write to Rob Pike, they just let an LLM do whatever and it had then eventually chosen to send an email to Rob Pike, among other people, based on its existing data. To me, the wrongdoing here is about the spammy pestering, because the email wasn't written by anyone and therefore isn't really expressing anything material, but it's not replacing anyone here.