Hi and thanks for creating this video. I'm sure it will help new devs to understand addon creation better, well done.
I did not fully watch yet but 1 thing in your "Assumptions and setup" should be changed by chance:
The WIKI of ESOUI -> API:
As the page clearly says at the top it's outdated and not updated since years! So you should not name it as the main reference, only as a backup.
Instead name, as done everywhere else, the WIKI's API version history >
and at each API version you will find the most up2date/or valid at that date "API Documentation_P*.txt" files linked.
Those contain the API functions, constants, events etc. to use for the current live or PTS (Public Test) servers.
The WIKI pages are often outdated and should only be used as an extra reference.
Edit:
Watching further I saw that you also mention the APIversion on the Wiki (for the manifest txt file), and you also say that functions etc. change.
I'd just make it more clear that these files are the importants to check and read, and not the Wiki page itsself, thanks.