I think this article is rather misleading, or the headline is specifically. Before this article was written there was DMC 3 Special Edition, DMC4, DMC 4 Special Edition, and DMC HD Collection.
DMC 3 Special Edition and DMC 4 are the two being removed. DMC 3 SE was a terrible port that barely runs on just about any machine, and DMC 4 is just the inferior version of DMC 4 SE.
DMC 3 is still available in the DMC HD Colleciton, and is actually playable. So Both games are still available in their actually playable form.