> But that screenshot showing an example of poorly written code.

That screenshot looks like it was specifically written for the blog entry. (The project is called ConsoleApp1.)

I suspect the author didn't want to show their employer's proprietary code on their blog, and probably wanted to make a concise screenshot with multiple errors.

(Otherwise, they might have people who don't have a programming background occasionally writing non-production tools as part of a non-software-engineering job. This is quite common in many workplaces.)