Do I need a DVI-I to DVI-D cable?

The four surrounding pins on the DVI-I cable are to carry the analog portion of the DVI-I signal, useful for converting to VGA or other analog sources. They are not used in the digital-only DVI-D signal.

The guide is correct: for a DVI-I to DVI-D connection, you will want to use a DVI-D to DVI-D cable.