That was mentioned in the article, the Shotgun. It required two phone lines and for many ISPs two accounts. For that price you could have gotten an ISDN line and has better performance even with similar bandwidth.
At least in socal Pacific Bell territory, ISDN didn't have an unlimited tariff, so you'd be paying per minute when you were online, and a lot of ISPs charged more for ISDN as well.
My house only supported 24K modem speed due to loop length but I discovered they (Qwest) could provide basic rate ISDN. There was a tarrif that allowed unlimited long distance connections and so I dialed into UUNet in Virginia, permanently. Latency was excellent.
So it was. I didn’t see it the first time. We got one of their graphics cards for Christmas and my Dad ended up having to buy a new motherboard to support it haha. Back when things weren’t nearly as standardized as they are today, and were also moving very fast.
I was able to get 30-50 mbps when I finally got a smartphone I could tether in 2005. DSL didn't arrive where I grew up until probably 2012-2013.