[Layback_]

Again, many thanks to Ammako, jeruku and Seerah.

I just tested the solution but, hmmmm... ultimately, it still does not fulfill my need.
I mean it's definitely a valid solution.

The reason that I made another Lua file called Loader.lua is because I thought doing so would also prevent those libraries and media files being loaded, but no luck lel...

Like Ammako said, they are not being loaded since the next login or at least with ReloadUI() (after addon being fully disabled).

Perhaps it is impossible to actualize what I want.