I mean that the prompt is not like code. It's not a set of instructions that encodes what the computer will do. It includes instructions for how an AI can create the necessary code. Just because a specification is "translated" into code, that doesn't mean the input is necessarily code.
What is conceptually different between prompts and code? Code is also not always what the computer will do, declarative programming languages are an example here. The only difference I see is that special precaution should be taken to get deterministic output from AI, but that's doable.