"MacBook Pro" should be "Mac Pro"
This article is in error. It describes a feature of the Mac Pro, but says it's about the MacBook Pro. The MBPR does not have a Toslink digital audio port, but the Mac Pro's description says it has a "Combined optical digital audio output/analog line out".
I would love to learn that my MBPR Late 2013 actually does have a Toslink digital audio port, but Apple's own pages does not say so.
MacBook Pro with Retina display