Only $500, such a deal! At least they entombed it with an AC adapter connected. The idea itself is dumb enough that it wouldn't have surprised me if they had encased it in concrete with a battery.
On a less humourous note....
How good is concrete as an EM shield? As a muff can be noisy anyway, I can't see this being remotely "playable"...
This pedal derives its amazing tone due to the superior thermal and mechanical stability supplied by the artisinal M70-grade concrete enclosure that's hand-poured in our Oregon facility by our team of dedicated craftsmen. This pedal has 10,150 psi crush resistance!
When you absolutely, positively got to have the heaviest tone in the room, accept no substitutes!