I'm still watching the video, but I have a quick question. I have a background in computer science, so naming conventions tend to be something I notice. You named the geometry "Suzanne_GEO" (geo in all caps), but then named the rig "Suzanne_rig" (rig not in caps). Is this important for the future, or am I going crazy?
You are not going crazy.
This is one of "the inconsistencies in my own work" I mentioned in the video.
My naming convention is always evolving and improving - in the next course (coming soon), I will explain why I have mostly adopted the Rigify naming convention these days.
(mainly to keep as many Blender users on the same same, as well as ease in doing fancy things with python)
Hope that makes sense.
Thank you so much! I just got to the video where you address this.