I still didnt understand what is he doing, what system is he using, could explain?
He isn't using a system, he is flatbetting.
To get a profit of 200k with a 0% house edge? It pretty much means impossible
It's impossible for one person on one try. But take a LOT of people trying this, and maybe one person will do it. Thats the point. That one person is not an impossibility, and if you are a casino operator, you will not want that possibility to happen.
Do you know the chances of that happening? Winning 200.000 times more than loosing? With a 50/50? Calculate them and then you will realize how mistaken you were