teaser 4 tells ya they are marked.
Not directly. It's possible they're marked, but it's also possible that he had them in stack order. He was counting the cards and revealing perhaps every fourth card.
One way or another, this definitely appears to be a deck aimed at gamblers and magicians that perform gambling routines. We've already seen a back with a borderless design that
resembles the Bee Diamond Back without actually being one, and I'm told that's a notoriously easy deck to mark because of the back pattern. Can't say I've ever seen one that was marked, but I could easily imagine a few ways to do it.