In the article, they says that "a smart business should appreciate those who can accomplish tasks in less than 8 hours, as they can achieve more in less time, and if they're engaging in non-competitive side work, perhaps their compensation should be increased to prevent them from pursuing it full-time."
However, this places employers in an impossible situation. Many companies already provide competitive salaries for software developers. Additionally, if an employee has a second job, it can be argued that their performance might suffer due to being overworked in such a cognitively demanding role.