If it was designed, it was designed by a designer. That that designer also happened to play other roles, or that it's a CLI and not a GUI is immaterial. You're clearly confused about what designers do and who they are.
If I deliver a letter to a friend's house, that doesn't make me a mailman. But even setting that aside, I could have simply written "not a designer by training" or "not a designer by trade" or "not a professional designer". Boring.
