Earlier quoted context omitted.
I thought they used portions of Terraform's code. Clearly, based on my downvotes, I'm mistaken and should be ashamed.
I think it was still a good question. Pulumi is relevant if we talk about cloud orchestration in general, and is a Terraform alternative. Terraform is an abstraction over cloud APIs and there isn't anything which would stop the development of a HCL -> Pulumi compiler for example.
[1]: https://www.pulumi.com/docs/using-pulumi/adopting-pulumi/mig...