I still think this was the wrong opinion. If the cards are not shuffled that is a clear violation of the rules of the game. No such violation occurred here.
There are no such rules about card orientation because usually casinos use ones with symmetrical backs.
Casinos use cards that they hope have symmetrical backs. In this case they were not symmetrical. Now who's fault is that? The player didn't bring the cards to the table, the casino did. If they want to cry foul and say those games are void so they don't have to pay out $10M, how much do they have to give back to players who used those same cards? They can't have it both ways. Were the games that were played with faulty cards valid or not? If not, time to start refunding a lot of money.
It's not that the cards were marked because they were asymmetrical, it was the combination of the asymmetry and Sun manipulating them that caused them to be marked. So other games with those cards are fine as long as none of the players were manipulating the game so that asymmetry gave them an advantage. The player didn't bring the cards, but they did purposefully manipulate them to effectively play a game with marked cards, and that's why the game wasn't legit.
I still think this was the wrong opinion. If the cards are not shuffled that is a clear violation of the rules of the game. No such violation occurred here.
There are no such rules about card orientation because usually casinos use ones with symmetrical backs.