The article summary needs to specify that it's about offering RESIDENTIAL service. Thousands of ISPs offer gigabit Internet access in datacenters and businesses all over the US. 84 of them also reach the home.
Of note - ALL current US ISPs offering RESIDENTIAL gigabit service do so on the oversell model, such that they CAN deliver UP TO 1Gbps to a customer, but likely will be delivering less as they share upstream bandwidth across facilities, areas, and customers. This is not a Bad Thing -- it's how the costs are leveraged across multiple residential customers so it is 7-10x lower than business-grade gigabit service.
This is a really great thing!