From their site...
"...dark energy in an unknow form of energy which is hypothesized to permeate the space..."
Dark Matter sounds more concrete and substantive, and in the marketing it seems like they are using the dark energy theory even though they are both different. Maybe alluding to dark matter containing energy from the gravitational force it creates, like it does in the halos of galaxies.
(On a side note , I'm not this educated, I just read a cool article on the topic in the National Geographic.
http://www.nationalgeographic.com/science/space/dark-matter/ ):grin-square: