Epic Story says I have Aftermath with GOTY

As the title says. I have GOTY from Epic, probably a free game situation I dont recall when I got it but have never played it. I saw the Twitch drops and thought maybe Id give this a go. Reading about Aftermath DLC but Epic store shows Base Game: WWZ Aftermath in library. I dont see any way to buy it other than Deluxe Edition. So do I have Aftermath with this version on Epic? I read it was supposed to require a upgrade from base game.