Yes, you're right. The self-assembly of the nanorobot is done using the same technique as in the video you linked. In fact, the speaker in the video, Paul Rothemund, is the person who first engineered this self-assembly technique called DNA origami. In his cover article in Nature (2006), where it was first published, you can get a sense of how intricate the folding technique is just by looking at the cover picture of the smiley face he made using DNA (http://www.nature.com/nature/journal/v440/n7082/index.html, the diameter of the smiley face shown here is roughly 100 nm wide).