It's not marketing speak. It is a clear, simple, and short sentence that describes exactly what S4 is. It doesn't have irrelevant details ("we use technology XY

It's not marketing speak. It is a clear, simple, and short sentence that describes exactly what S4 is. It doesn't have irrelevant details ("we use technology XYZ for distributing our nodes"), nor very much marketing describing the value ("S4 solves all your problems!!!", although they do use the word "easily" once). If the terms used are not clear to someone reading it, they are probably not the right person to implement a good distributed system anyway.