He said "generate". This is trivial to do. And probably this is what Amodei meant when he said 90% of code would be AI by now. It doesn't meant that generated code is actually useful and gets checked in.
Trivial is a pretty big word in this context. Expanding an idea into some sort of code is indeed a matter of waiting. The idea, the prompt, the design of the overall workflow to leverage the capabilities of llms/agents in a professional/long-lived codebase context is far from trivial, imo.