Do Docker images still work in Kubernetes?

Yes, definitely. Kubernetes has given the green light on its blog. Docker images are still supported because they are compatible with OCI (OCI = Open Container Initiative), i.e. they are OCI-compliant. This means your Docker images can still be operated in Kubernetes. The reason for this is as follows: The image that Docker creates is not directly a Docker-specific image, but an OCI image. And every OCI-compliant image, regardless of which tool is used to create it, looks the same to Kubernetes. Both containerd (i.e. part of Docker) and CRI-O can retrieve and run these images.