Node 2 and 3 configuration file missing authorization: enabled in Lecture Notes

I noticed that the line in the configuration file for node 2 and 3 in the lecture notes are missing the security line:
authorization: enabled

which is shown in the video.

This line is implied when you use “keyfile”.

Thanks for the clarification. Why was that line added in the video if not needed?

He says in the video (1min10) that the line is implied but he leaves it “for clarity”.