Yes, it's based on Terraform.
Your GitHub repo looks super useful! Thanks! Thanks! Thanks!
At the time of writing, when you "eject" an architecture, we remove all the "user-friendly" features that we've added.
So you have a fully-working architecture in your own cloud provider account. Like the one you could have been created using Terraform.
We've thought of adding an "export" feature to export all the Terraform/Ansible/Packer... files.