Why let facts get in the way?
It's just bizarre that they'd take a court decision that doesn't have anything whatsoever to do with the 100-mile border exemption, and then make it about the 100-mile border exemption, especially considering the fact that there is no 100-mile border exemption in the first place.
While there are actual federal laws that allow the 100-mile search exemption, the Supreme Court has clearly and repeatedly confirmed that the border search exception applies only at international borders and their functional equivalent (such as international airports).
That's why they need reasonable suspicion, probable cause, or your permission to search you at those inland border checkpoints along the Mexican and Canadian border, but if you cross the border from a foreign country they don't need any of that. If you travel internationally with a briefcase, customs can and will open and inspect the contents of that briefcase. They'll do the same thing with an electronic briefcase, like a laptop or a smartphone.
I've had my laptop seized and thoroughly inspected at a border crossing twice. Both times by Canadian Customs officers. The guy at Ft. Erie was nice and pleasant about it, but the Barney-Fife-on-steroids, Rambo-wannabe (with his shaved head, tapered short sleeves to show off his bulging muscles, and his pants tucked into his boots) at the middle-of-nowhere crossing at the northern tip of the Idaho Panhandle was a Royal-sized PITA.