“Production code” in phone screen for Square

I had a recruiter chat with Square a while back. The follow up email talking about the phone screen said I should write as if it were production code and “not just interview hacking,” and that I shoul

I had a recruiter chat with Square a while back. The follow up email talking about the phone screen said I should write as if it were production code and “not just interview hacking,” and that I should read CTCI in preparation. Is this reasonable?