I'm not sure how this would apply. Are you implying that if the company operates on Python, you can hire someone with great "raw intelligence" who have only developed C++ all their life, and they can start contributing on day 1?
You need to clearly list what the position entails, otherwise you're wasting time.
Likewise from another job post: "Have a strong background in kernel-level systems". Not possible if your whole resume is building web apps, may be possible for someone that has only used c++ professionally.
In your particular case, no not on day 1. But they can probably make meaningful contributions after 2 weeks. They'll pick it up quick because they're some of the best talent on the market.