The video is referring to how much it would cost to pay to have the pages done in pencil or ink by other artists.

The cost of supplies to produce your own comics is much less. However, you should consider your time in the equation. How much do you consider your time is worth when creating the comic including the pencil/pen work?

The creator of the video must create the comics then pay to have others to pencil or pen and ink them into colour version.