What would it mean to "understand" it. Imagine a program written by such a system, it's easy to imagine an immensely complex question about the system that soun

What would it mean to "understand" it. Imagine a program written by such a system, it's easy to imagine an immensely complex question about the system that sounds simple, for instance asking about design choices, code architecture, aesthetic choices like expressivity. Even if it could produce some code, we couldn't say it understood it if it couldn't answer those questions, and those are very difficult questions which would require human-level intelligence, and even more a human psyche.