If you use the AWS Marketplace to launch the instances, you will find different products depending on the Virtualization Type of the instance.
In this case, you are using the PV option and I was using the HVM one (the one that doesn't have PV in its name). We suggest you use the HVM option as its performance is better than the PV's one.
You can also follow this guide to launch any Bitnami Magento image using the AWS Console.
Please note that you can also launch the community images instead of the Marketplace's ones (both are the same but the Marketplace's ones are published by the AWS team after passing some validation tests).
I hope this information helps.