Was really glad the article you linked mentioned Robert Bork, because it's important to realize (a) this shift to the consumer-welfare standard is relatively new in US jurisprudence, like since the late 70s, and (b) if you consider, like I do, that Robert Bork was a Grade-A Turd for numerous reasons (can start by looking into the Saturday Night Massacre), you can see how this reading of the law is well in-tune with lots of other shitty ideas from Bork.

For more info: https://en.wikipedia.org/wiki/The_Antitrust_Paradox