Barrett Hi!
Sorry for the late reply.
I understand why it's confusing, you do not need that enum builder script, it was for myself to create the initial Tags and Layers scripts and I should remove that comment line at the top.
In fact on your side you have a LayersCreator.cs file that reads Tags.cs and Layers.cs to recreate these tags and layers in your own project if they don't exist yet.
Does that make sense?
If you want to add tags and layers, you can add them in the Unity project as usual (top right corner), you don't need to add them to Tags.cs and Layers.cs. In fact these 2 classes might get overridden next time you download a plugin update, and these classes are only for Home Designer's purpose.
If you do plan to extend the plugin for your own use, then yes feel free to add more values in these files manually, but I would avoid upgrading the plugin in the future to not lose your changes.
Let me know if you need any more clarification 😉