The color layers in the machines start as 3D printed molds, micro-channels are then created with silicon that allow colored liquids to be pumped in to match the robots surroundings.
Her evidence is that many of these layers contain animal burrows that seem to start at the surface of the layer, suggesting that the layer in question had been buried subsequently.
This is easier to figure out in established companies than it is in start-ups, and the older the company and the more layers of IT that have been added over the years, the more difficult it is to ascertain what connects to what.