You need the AI eventually building another AI for the name to apply. This page is just bullshit. They vibe-code their harnesses, and yes, it shows.

Anyway, what does recursive self-improvement even means for neural-network based AIs? It's not clear it's possible at all.

Where do you see evidence of vibe coding the harness? (and who are you talking about, Anthropic or the link I shared?)

It seems odd to complain about a AI coding tool being coded with AI. That's just eating your own dog food. In my opinion it makes it better, because the tool is very well tested.