Quick scan of the repo and I didn't find the prompt or the setup of the harness, but I'd say that most people using DeepSeek are probably also not use it raw and without any guidance.

Is a zero-shot, zero-context prompt a useful benchmark? Yes, in the absolute sense. Does it reflect how teams would use it in the real world? I think in real-world use cases (IME), DeepSeek gets the job done.