For 200A read somewhere around 25-30A if you're lucky. I suspect the rating is based on the maximum MOSFET rating (like many car controllers). These in turn are based on the MOSFET being on a large force-cooled heatsink and kept to a temp of 25C. These have no heatsinks
I guess you could put 200A through it for about 1/100th of a second before the smoke comes out. The real giveaway is the size of the wires in the picture. Can you imagine 200A through those weedy wires ?