She's referring to case law. The WSJ and the US Chamber of Commerce have been gunning for Lina Khan for a while now but I wouldn't bet against her. Even when losing, she's expanding how antitrust should be enforced, eg in the FTC v Meta case, the court seemed to accept [1] the FTC's argument about "actual potential competition", setting a precedent that the FTC will likely use in future cases.
1. https://www.wlf.org/2023/02/24/publishing/actual-potential-c...