Invisibility Cloak Made From Silk

Excerpt from the article:

For the first time ever, scientists have created an invisibility cloak made from silk, and coated in gold.

The new metamaterial, as invisibility cloaks and their kin are technically called, only works on relatively long terahertz waves (a region of the electromagnetic spectrum between radio and infrared light)[...]

In other words, they haven't "created an invisibility cloak". They have discovered some interesting properties of a new material based on silk.