Yes; the USA does allow their Exp Cat aircraft to fly IFR, but you have to get some kind of signoff to allow it, and have to carry appropriate equipment.
I think the plane which is the subject of this thread is all plastic, however, and probably not bonded.
It is unfortunate that the ICAO CofA regs strap us into this regime but OTOH if it wasn't for ICAO there would be no GA in most of the world.