I'd hanker a guess they are thinking about cross platform while writing this game. It's using SpatialOS which is a pretty neat back server platform and also what enables a small studio like this to make a game that can scale to 100's of k of concurrent users all without having to worry about hosting the game themselves and investing in their own hardware and data centre costs.
SpatialOS is designed to support cross platform and even different clients. Think of flying a plane on Xbox while your mate the other side of the world is your bomber using a top down view on an iPad.
This is what SpatialOS allows, all in a massive, persistent online world. Exciting times lie ahead.