It unfortunately is - and at least where I live it would go through to court and may reach a conviction on that. But I think it's clear here that she didn't intend the "others may view it part." While it's true that Anthrophic staff may read it, she didn't intend for Antrhopic staff or anyone else to read her messages. Ergo, she didn't intend for anyone to be threatened

I think Anthropic did the right thing to report it due to valid safety concerns. And if they had found credible plans for her to attack I think she can be charged with attempt. But just using AI as a diary I think the prosecutor's office is reaching beyond what the law allows but unfortunately I think there is a possibility that she may be convicted.