Salto CLI for Jira

Has anyone used Salto (https://github.com/salto-io) for Jira Data Center before? It looks really promising from a declarative GitOps approach for configuration management.

I’ve got about as far as installing the CLI and trying to get a connection to Jira, although maybe I’m misunderstanding how it works (just getting 403 errors). Does it work for Jira DC instances that aren’t Internet connected?