This wasn't about card counting (which is an integral part of blackjack strategy and certainly should be legal in any jurisdiction that allows casinos to operate). Counting takes place in your mind. Breaking into the casino's surveillance feed to learn extra information is outright cheating (and therefore, theft). I'm curious to know what information the player obtained. I can't imagine there are cameras low enough to glimpse the dealer's hole card before it is set down. Perhaps multiple accomplices each watched a table, keeping count and waiting for the count to be high (meaning the chance of drawing a ten-value card or an ace was very high), and then told the player to move to that table?
The article doesn't even say what game he was playing. It wasn't necessarily blackjack, which as you observe doesn't confer a big advantage by knowing the enemy cards since your bet is already set and your strategy mostly is. Poker permits the most leverage for knowing hidden information, but in poker you scam the other players, not the casino (casinos very rarely offer poker games played against the house.)
Maybe it was Pai Gow Poker, which does have strategy that can be exploited by knowing the dealer hand you need to beat, and is often played for high stakes in VIP rooms.
