We understand "superhuman coding" to mean very different things, and I think it's a me problem that I can't figure out where you're coming from, because it doesn't sound like our practical experience differs. I'm going to have to think on this.
Just like AlphaFold 2 genuinely increased the weak sequence but strong structural homology detection of proteins, but it did far less for out of sample domains and it provides no intel into the kinetics of folding. Details matter. And nobody likes to hear about them.
I see similar conceptual gaps in coding agents when I work with them, even Astra and Fable, so maybe this a is decent proxy to describe the gap between hype and reality.