The post is about deploying a Django app on what would normally be a single server. What you describe can be done with various tools like Kubernetes, but it's outside the scope of the post. The difference is, indeed, not as big when you only have a single server, but it's still nice to not need to run a dozen commands to go from "blank server" to "running app".

If only it were easier to have seamless upgrades, it would be perfect.