Epic's lawsuit does not accuse Apple of tying App Store sales to phone sales. Two of the nine counts are about allegedly tying in-app purchases to app sales, and the rest don't involve tying.
But since you mentioned it, I'm not really sure that Epic will succeed with their argument that the "iOS App Distribution" market is the relevant tying product market absent an analysis of the overall smartphone market.
But since you mentioned it, I'm not really sure that Epic will succeed with their argument that the "iOS App Distribution" market is the relevant tying product market absent an analysis of the overall smartphone market.