At the stakes Ivey plays there is always at least a pit boss nearby monitoring all the action, so in this case not only did the dealers comply but the pit boss

At the stakes Ivey plays there is always at least a pit boss nearby monitoring all the action, so in this case not only did the dealers comply but the pit boss either implicitly or perhaps even explicitly approved it as well. On the other hand at these stakes every casino staff member will go way out of their way to comply with any request from the player. In these cases the pit bosses must not have been aware of the concept of edge sorting or surely they would not have allowed it. I'm surprised that a higher end casino like Borgata that regularly faces this level of action doesn't train their high limit floor staff better.