You are probably right on all accounts. The schematic is only $5, but that being said, if it is not useful, then it is just throwing away money so.....
I thought it looked kinda cool but am still lacking in my knowledge greatly to know how useful it may or may not be as far as a circuit/build point.
On a different note; I did tend to think the box he made had a bit more of a natural sound than the Ox, but without being in front of the original amp, I couldn't really know for sure.
My Rivera has a built in Rock crusher system that I find crazy useful, would be cool to have something else of that nature that didn't cost an arm and a leg.
I thought about grabbing the schematics and giving it a go myself, but it would just be out on the back burner for now - time is crazy squeezed for a bit.