I think that’s a placeholder image. My guess is that this extension cord is only going to be like 4’ long since that’s all it needs to be, and it’ll be a very thick cable, so any longer and it’ll be too heavy. If it even becomes a real product.Hard to see from the photo in the link you posted (I've been watching that product for a while myself), but I have concerns that what is pictured would be able to handle 600-700 amps for any length of time (250kW at 350 to 400 volts)...Would love to get my hands on one to see what the limitations are, though...