The cable is DVI-D (Dual Link), the adapter is DVI-D (Dual Link), and the port on the Wacom appears to be DVI-I (Dual Link) except with a vertical socket for "Analog Ground" connection which is missing in DVI-D – but from my understanding this shouldn't be an issue. Could be wrong, not my area of expertise.
However, in the past I have used this device with a Late 2008 Macbook and a DVI to Mini DVI adapter to the Mini DisplayPort, back when Apple was pre-Thunderbolt, same cable and it worked like a charm.
I've contacted Wacom's support, but they usually take a day or two to get back so I'm hoping someone here can shed some light.
Thanks in advance.