"Network traffic from Amazon QuickSight then originates from this network interface when Amazon QuickSight connects to a database or other instance within your VPC using a VPC connection. Because this network interface exists inside your VPC, traffic originating from it can reach destinations within your VPC using their private IP addresses."
It's not PrivateLink - it is an ENI in the VPC which allows QuickSight to access data sources within a VPC. Since it is an ENI there's no data transfer fee within an AZ. If the traffic cross AZs there'd be an inter-AZ data transfer fee.
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