I wouldn't read too much into it. It's clearly LLM-written, but the degree of autonomy is unclear. That's the worst thing about LLM-assisted writing and actions - they obfuscate the human input. Full autonomy seems plausible, though.

And why does a coding agent need a blog, in the first place? Simply having it looks like a great way to prime it for this kind of behavior. Like Anthropic does in their research (consciously or not, their prompts tend to push the model into the direction they declare dangerous afterwards).