Where did the article say that? To me it explicitly claims it was outsourced:

the McDonnell Douglas influenced Boeing new one tried to patch the problem with software. And it was bad software, written by to engineers paid $9/dollar an hour.

And I am not blaming the software engineers for building it to the specification. In contrary, I clearly stated, that just building it to specification isn't enough for such critical software. Such software needs to be developed in teams where enough team members are senior enough to properly raise concerns where appropriate.