The conclusions made in this blog seem wrong, it's perfectly fine to write these kinds of tests if you have to as part of a rush job, but WHY DO IT ON PROD? You

The conclusions made in this blog seem wrong, it's perfectly fine to write these kinds of tests if you have to as part of a rush job, but WHY DO IT ON PROD? You know 100% that you are making calls to the 3rd partys' prod, assuming "random" numbers aren't real is incredibly negligent.