Hi Jessemessy.
That’s Tim there in one of the concept courses. He demonstrates how to draw a character model sheet in Photoshop for the purposes of modelling the character in 3d. Sadly, he doesn’t show how to rig it as it’s not possible to do in Photoshop.
We will have more Grease Pencil content in the future, however what you are wanting to do is some pretty advanced stuff.
If we figure out an easy way to teach it, you’ll be the first to know.