For AWS there are EBS volumes attached through a custom hardware NVMe interface and then there's Instance Store which is actually local SSD storage. These are different things.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Instance...
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Instance...
Also, both features use Nitro SSD cards, according to AWS docs. The Nitro architecture is all locally attached -- instance storage to the instance, EBS to the EBS server.