Here's an archive of a live discussion about this issue at Redbubble. Also see a definition in the glossary of of a reputable printmaking company (Pace Print). In my opinion, the key issue to be addressed is whether the artwork in question is a limited edition (using the same printer, same printer profile, numbered, signed, etc.) or unlimited reproductions (any printer, any printer profile, etc.). Digital prints are no more than a creative output captured with ink on a substrate (paper, canvas...) for the delight of the viewer's imagination. In fact, similarly to traditional printmaking, the substrate that I use to output my work greatly affects its outcome, consequently impacting my own creation process. I consider my limited edition artworks as a part of a 'digital printmaking' process.