Azure IoT Edge open for developers to build for the intelligent edge

Can someone from Microsoft comment this and https://azure.microsoft.com/en-us/blog/securing-the-intellig...?

Does this mean Windows IoT 64-bit on Arm edge gateways? Is SBSA and SBBR mandatory?

How does this contrast with Google IoT Core on the Marvell A8040-based Clearoud (https://www.solid-run.com/clearcloud-cloud-iot-core/)?