Bollocks
GCP hasn't picked Nutanix, this is an obviously false statement. Nutanix has picked GCP for resale for their Xi product in a desperate attempt to be the company that does everything. Also, works only with AHV (market share 0.02%). For everyone else, namely those running ESX and Hyper-V, AWS and Hyper-V are available out of the box.
As to GCP/GKE, if anything, Google has picked Cisco for on premises container/microservices with Kubernetes and Istios. And it's a real technology alliance instead of a reseller agreement.