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It is only a "node app" if you select Javascript/Typescript as the language of choice to write your infrastructure code.

I think the person was talking about pulumi cli itself. not the infrastructure program.

You are understanding it correctly. The Pulumi CLI is indeed Go, as are the multitude of the Pulumi providers, which are separate binaries and processes.

The Pulumi architecture shows the different processes at play nicely:
<https://www.pulumi.com/docs/intro/concepts/how-pulumi-works/>