How about I buy something in bundle, is that also "Single Project License"?
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The license doesn't change because it is in a bundle deal. Basically you can use each packaged item that is in the bundle one time. It doesn't mean you use one thing from the bundle you can't use the rest. The items still retain their individuality on license terms.
Ex. You buy a bundle that come with a forest tileset, dungeon tileset, forest font, and dungeon music then you only use the forest tileset for your first project. You will still have dungeon tileset, forest font, and dungeon music that you can still use for your next project.