Not too much secret going on there, everything you need to know about that oven is visible between the two videos. It's definitely not a kiln.
It's double wall stainless steel HVAC fittings with what looks to be about 2" of insulation. My guess is the insulation is ceramic fiber but mineral fiber would work too. The top is 3 quartz infrared elements. There is a PID there which may be controlling the quartz elements based on the temperature of the stone, but it could just be used as a cheap device to display the temperature from a thermocouple...chinese PID's are cheaper then most other devices for that use and I personally would not want a PID to cycle my elements off during a bake.
Based on the temperatures the PID is showing I would guess the stone is pretty standard cordite. Based on my experience using IR elements for pizza I think it is safe to say this oven does not run off a standard household outlet. I wouldn't be shocked if it is 3 phase given the commercial ovens it is pictured next to.
Unless I'm wrong and this oven does use a standard outlet I don't see much of interest here. I'm not overly impressed with the design or the pizza it is shown producing.