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So, the 4th section is not for creating K8S cluster but cloud independent code for adding new services/pods etc

its for both creating k8s clutser and doing cloud native deployments on those clusters

That’s right - the Pulumi kubernetes provider lets you work with resources inside a kubernetes cluster.  So you can combine that with one of the other cloud providers to manage both/either of the cluster itself and the resources inside it. That could be to setup core services within kubernetes, to deploy app workloads into kubernetes, or a wide variety of other tasks related to the broad range of Kubernetes use cases. 