I wouldn't have a problem if they didn't claim that they made the engine lol. XD
Where did they do that? I read the description and the devlog. Did they also claim to have programmed it from scratch, instead of using a premade engine such as Unity?
Do you refer to the comment below? The context was for the whole game engine, because it might run on emulators on Android. And not for the card game mechanic engine/asset in particular.