Perhaps bad terminology on my part but I would argue that Terraform IS cloud agnostic, it is NOT cloud portable.

You can use Terraform with any cloud. You cannot seamlessly move your AWS configuration to Google Cloud but you can still write Google Cloud configuration with the same paradigm as your AWS configuration.

At first I read: Every prisoner is specific to the platform. It seems to clarify the point anyways.

Right, but the HCL syntax and overall Terraform paradigm is not.

it’s not just the provisoner. it’s. it like different clouds have the same abstraction. for all intents and purposes you need to understand the underlying cloud and how to use api/tooling around it when terraform fucks up