Hmm not sure most of the "digital" stuff was not about the earpods but about the wireless ones AKA the "AirPods"
The ones that come with the iPhone 7 in the box are the regular earpods we have now just with a lightning connector, there have also been a few videos going back to july about the 3.5mm connector some of them taken it apart it doesn't seem to have anything in it.
o.0 Did you click the link? It goes to right when he starts explaining Earpods switching to lightning, with "digital audio" written in the slide, and reiterating "digital audio" multiple times.
They specifically said in the announcement that the earpods are digital not analog: https://youtu.be/G6I-IKYEVMI?t=21045