It's on Android, but they meant that it's not on the Play store. They brought Fortnite up as an example of a popular app not available through the Play store. They don't want this to happen to iPhone apps in the future; they'd prefer either that the app is on the Apple app store, or it isn't distributed at all.

Yeah that was my bad, I meant the play store which is why I linked too that.

That is why I brought it up as an example, it is a major app that is ditching the play store on Android just like they have announced they will be doing for iOS.