Total Conversion Cooking is for when a mod edits the core game data directly, meaning you don’t make a mod folder and copy files, you do direct edits to the base files. You want to cook as a mod if you made one using one of the tutorials here, and didn’t change any core files, just copied and remapped. If you changed core files you would cook as a TC, but from your description it looks like you didn’t, so you cook as a mod and it should work the way it says in the tutorial you used.