But one thing that is not detailed is how FAR the detection happens away from the table. Can they be tracked as you walk around? As you pass through an exit?

According to the site you linked to and other references on the Internet, the system has the capability to do a lot of things. It can tie into the surveillance system and be directed to follow security to the tables to make fills. Calculate roulette bets on all betting spots to a height of 30 chips and provide the dealer with payout amounts to each player and monitor the chips going to each player. When chips are moved from one table to another, the system knows how you moved and then played those funds, either by knowing your Player Card # or by facial recognition for those who do not use a card.

What is not discussed is how this technology can be used to detect money laundering activities and also provide Government Agencies the ability to validate win and loss claims.