I recall borrowing my friend's Ford Focus, and it had the same deal. Here is a video which shows the location which I thought was pretty common:
Ford Focus ZX-3, How To Add Windshield Wiper Fluid - YouTube

But to your original point, I checked the photo info on the EPA website, and it is described as "Photo of antifreeze being poured into a car" which is clearly wrong. That is wiper fluid.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).