Neil - I agree with keeping an open mind and I agree about needing to hear something for yourself.
As you say it is an object and placing it between the speakers may do something to change the perceived sound, but then so will a placing a large rubber plant there. That still leaves some questions unanswered, and that is where my personal criticism lies.
The review does not explain in any way how it works. By the time we have got the sound out into the room, which is where this object has its effect, we are dealing with standing waves in air. So the only effect it can have is on those standing waves. An O level physics explanation would suffice. But there is nothing.
Bearing that in mind why does it need to be made of bronze? Why not plastic, or concrete, or hard baked mud? They would all reflect sound.
Why does it cost $2K? Is it made of bronze so that there is some perceived value that can warrant the price?
If it does have a measurable (and therefore potentially audible) effect, how is this consistent in any room, with any type of speaker or set up configuration? It is a room treatment that works the same in any space? Really?
Current Lash Up:
TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.