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the combination of other colours would be in print and not within the image
some printers use all colours including black to print the colour black rather than just using black on it's own
some printers have different shades of black to render shadows more accuratly
if you mix colours the final colour would be darker than the two original colours to a point where all colours mixed would make black
if you mix coloured light ( your monitor ) all colours make white
what you have been reading is refering to print as you are contemplating having your images printed by a 3rd party it doesn't really apply in your circumstance
i think what they mean by the statement make sure black is 100% black is different monitors may make parts of an image look black when in reality it's more of a grey because the monitor is not set up ( calibrated ) to accuratly show the true colours/shades of the image
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