@hamje32 - I think you’ve identified examples of job related duties that the article is talking about and which are the responsibility of a supervisor.
I believe that knowledge is not the most important thing here however. I believe that a supervisor needs to be relatable. I’ve been in some companies where nobody wanted to approach the supervisor for fear that they were going to get snapped at.
Sorry, but this is not a good trait to have as a supervisor. You are there to pull your team together, and no man is too lowly on the totem pole to request your assistance.
I think the better you can be at building your team, showing your human side a little bit, the greater the morale you’ll have and the smoother your operation will be.