I don't think this author has articulated their point well. If they have, then their point is poorly reasoned and considered.

BUT

  If you think someone who works for the sake of money is
  a "horrible" person

This is not, at all, in the article. The author's thesis is that "money is motivation for work" is a horrific definition of work. Not that the people who hold that view, or the people who are motivated to work for money, are horrible people.