Essentially they were playing with marked cards, because Sun had memorized subtle flaws on the back of the cards. That's generally regarded as cheating in any card game.
Not quite. The manufacturer did not advertise or intend to create "marked" cards, so therefore this is not a "marked" deck, and it's not the players fault for the manufacturing flaw. It's the casino's fault for not executing a quality control check properly. This is a QC issue.
Want another example? A casino hands a player loaded dice who then starts one hell of a winning streak. The casino swaps out the dice. Turns out the entire batch of dice were flawed, and the player keeps winning. Proper QC would have discovered the faulty hardware before it even hit the casino floor.
In the same way, a component provided by the house contained a flaw, and players used that to their advantage. Don't like it? Fire your QC manager. And a judge not acknowledging this is wrong.
And of course, this entire argument is insulated in the irony that casinos are allowed by law to capitalize on addiction and rig games to their advantage. They're just pissed because someone else happened to be better at it for a millisecond's worth of their annual revenue.