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The operating system (which is on the boot volume) is stored on an EBS volume which is different to the instance storage. Instance storage is ephemeral (i.e. temporary) - it's high-speed, local disk attached to the instance; whereas EBS is network-attached storage. You can't boot from instance storage - it's intended as a temporary local disk for your application. More information comparing EBS and instance storage is here: https://aws.amazon.com/premiumsupport/knowledge-center/instance-store-vs-ebs/
Thank you Brettski-AWS. Your explanation is just what the doctor ordered!!!
Oh, I did have one more question based on your very nice explanation that made the distinction between local (Instance Store) and network-attached (EBS volume). If I have an EC2 instance running RHEL 8.x, with only one EBS volume attached, what would the device file name be fore the instance store?
Check out the documentation on device names - it talks to what it will be.