Watch the video again (timestamped): https://youtu.be/k1DxL-vyjfs?t=678
They cut directly from Blender scene, to 3D printer, to finished product. The editing and subtitles clearly imply that they printed the outer components. It's deliberately misleading, and these kinds of tricks are used throughout the presentation.
It's particularly hard to stomach the embellishment when the real work stands on its own so well. It casts everything else into doubt, and reflects very negatively on the creators IMO.