If I was caught carrying marked cards nobody would believe I didn't know. The casino has an entire anti-fraud department which exists to catch this sort of thin

If I was caught carrying marked cards nobody would believe I didn't know. The casino has an entire anti-fraud department which exists to catch this sort of thing and we're supposed to believe they didn't notice this for years... But that's only half the post you linked to... Importantly, the precedent involving the unshuffled deck didn't involve knowledge. Despite everyone's intentions the game was not setup correctly so it didn't count. If so, then these games (all games with these decks) were also not setup correctly. Either all games with these cards are improper or none are. And importantly, nothing other than penalizing the casino will change anything. This ruling incentivizes them to leave marks in their cards, dice, etc, and call them out in the future to invalidate any unpleasant results.