I would be surprised if the developers "rebuilt" Superhot. It's made with Unity. The work to port from PC to mobile with Unity is surprisingly easy. I would bet that they spent time replacing textures, testing builds in quest, recoding things that didn't work immediately, and tweaking render settings.
It's a good game and I'm fine with them choosing how they license it per device.
I just find it hard to believe they had a lot of work in the way of porting their game.