Yes, almost definitely that is what happened here. IANAL but typically you can't sue someone saying, if I did X then they would do Y and Y would hurt me. You have to actually say that they hurt you. Epic wanted to challenge Apple's App Store rules in court, and this is how they decided to do it. Push an update to the app, making it very clear that this update would help consumers with lower prices because American antitrust law focuses on keeping prices low, wait for Apple to take them down, then sue.