You have VWAN1 with hub Hub1 marked Unsecured. To mark Hub1 as Secured, Solution: Deploy an Azure NAT Gateway. Does this meet the requirement?

No, deploying an Azure NAT Gateway will not mark a Virtual WAN hub as Secured. An Azure NAT Gateway provides outbound internet connectivity for virtual networks and improves NAT capabilities, but it does not enable security features within Azure Virtual WAN. To mark a Virtual WAN hub as Secured, you must deploy an Azure Firewall within the hub. This integrates the firewall's security capabilities directly into the hub's routing, allowing for centralized network security policies and traffic inspection.