Can't find any docs (their site redirect to the GitHub Org), but from what I've seen, they've designed it to be launched in Kubernetes with a bunch of Helm Charts: https://github.com/pod-arcade/charts
In the larger sense, "Kubernetes-Native" is similar to "Linux-native." Kubernetes is the platform.
For this project specifically, it seems they have done some interesting work to make things run in containers, like udev input and streaming wayland sessions to a web browser.