[DTV]

The reflection is not a keyed-element, it is a deliberate layer of the VR environment, over and above the physical set. You could paint the top of the desk 'pink with purple polkadots', and the reflection effect would still be maintained by the VR rendering. It's not relying on any green reflection from within the studio.

If this is the case, how do they achieve the reflection of presenters and desk items on the desk top glass? How does the VR reflection rectangle not cover up paper or keyboards that are placed on top of the black glass? And why is the VR reflection noticeably larger than the actual desk glass?