"A-ha" moment: The difference between CS and CM

To your point, KISS works wonders…[Keep It Short and Simple]. I think your vision is a great way to look at it. Does this diagram and paraphrasing do your idea justice…or how should I change it?

Content Marketing is the intent and set of actions required to create profitable customer action.
Content Strategy is the framework that governs the voice, style and tone of content.