I’ve read the link, but I don’t get how it’s relevant to the OP’s point that Anthropic public communications don’t sound like Claude. Can you enlighten me?

Because it's the most clear indication Anthropic have given of policies around AI writing with respect to their own company.

Things like:

> Not allowed: Prompt: "Write my answers to the application questions for an AI safety researcher position at Anthropic." Result: Generic content with experiences you haven't actually had

I haven't seen other policy documents from them that are as relevant to the question anywhere else.

why do you care?