Do I need to report revenue for a free to play game

The affirmation above states that, if you use Unreal Engine for creating your game and publish it on Epic Games Store, then you don’t have to pay 5% royalty fees for using Unreal Engine. Is it something that I’m missing?
I know that you owe 5% royalties if you publish on other storefronts and exceed 1.000.000$ in lifetime gross revenue