It seems strange that it wasn't noticed? The mentioned game is meant to have fewer dealers operating it, but it says pretty explicitly that it should be supervised and have >=1 dealer.
I think he just is asking how the dealer didn't notice the cheating.
I don't see any arguments their making. They simply stated/asked a question, then provided some information and a citation.
I'm baffled at how that is somehow an endorsement of cheating and that its okay to cheat if no one sees them?