To me, term "Content Strategy" is a misnomer and should have been called “Content Management” or “Content Management Strategy” if you must. Consider this definition of Content Strategy by Kristina Halverson, 

“Content Strategy is creation, publication, and governance of useful, usable content”. 
This is very much about management of content and the way you make it useful and usable within the organization. Shouldn't we call this aspect of data management as “Content Management”? 

Now look on the other side of Content Marketing 

“Content Marketing is a marketing technique of creating and distributing relevant and valuable content to attract, acquire, and engage a clearly defined and understood target audience — with the objective of driving profitable customer action.” 

This definition is all about strategic usage of content and how to convey message to well define and well known audience. This is where strategy is in action. Shouldn't Content Marketing be rather called Content Strategy? When you write to an audience to fulfil an objective, it doesn't matter what “type” of objective it is and writing to make an audience “know and learn” is not much different from “know and purchase”. Content Marketing is actually Content Strategy and what we currently call Content Strategy is Content Management.