As mentioned in the patent, the (matte) finish is supposed to include "randomly distributed light-absorbing features that are capable of absorbing visible light."
Black is the absorption of all wavelengths of light. How does it
Apple patents 'Matte Black' finish technology for iPhones, iPads
Apple Might Introduce Matte Black Color on Future iPhone, iPad
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Apple patents a new matte black finish - HIGHXTAR.
How come, if black absorbs all colour, can you see colour in the
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Apple patent suggests that a matte black MacBook might become a
Apple's Matte Black Light-Absorbing Laptop Sounds Sexy AF
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Apple painted with Musou Black - A paint that absorbs 99.4% of
Light Absorbing Black-Out Material
The Space Black Macbook Pro Is Darker Than Ever
The Space Black Macbook Pro Is Darker Than Ever