I'm a very heavy daily user of Obsidian with about 8000+ personal notes organized across a fairly deep nested folder structure and can't envision a situation where I'd need something like this.
Littering my publicly accessible papers / blogs / etc. with highly idiosyncratic Obsidian shortcodes that only I have the means to access seems of limited use.
Hopefully the author will write another post going into specific use-cases for this extension.