“NVIDIA Kubernetes® Engine (NVKE) provides the management plane that platform teams install to create and operate Kubernetes clusters for their customers.”
I am more confused by its description than by just reading the product name and guessing.
NVKE is not a Kubernetes distribution and not a Cluster API flavour. It is a self-hosting factory for Kubernetes clusters: a throwaway seed cluster stands up a management cluster, and the management plane on it then provisions and lifecycle-manages many isolated workload clusters on demand.