Grounding with a Earth box?

The box is from the same company that makes vibb eaters -  cant make this up ...or can I?

thecableco.com/vibbeaters.html

These guys, probably just a guy with phenomenal sense of humor, are running to win the prize of some sort. And they/he may make some money along the way.

All grounding schemes from component to earth have different levels of impedance (ground potential). We know this much.
By no means am I an expert, but by wiring each component’s chassis (earth ground) to the grounding box and adjusting the settings, the theory is that an equal impedance to ground can be achieved.

https://www.synergisticresearch.com/isolation/ground-isolation/grounding-block/

http://www.graniteaudio.com/zero/index.html

Where’s millercarbon when you need him?

I believe it's a way to simulate star-grounding after the fact.

"Where’s millercarbon when you need him?"

In the room next door. He is finishing in room 4 and will be with you in a moment.