There's a difference between being curious about the exact mechanics and considering the activity itself novel. Apple manages the updates and signs app bundles

There's a difference between being curious about the exact mechanics and considering the activity itself novel. Apple manages the updates and signs app bundles that developers upload. They need to be able to redeploy packages and trigger updates just to deal with normal operational issues (eg. malformed bundles, versioning mistakes, or reversions). Those are just the operating expectations of any system like this. There's nothing unusual about Apple being able to competently manage a relatively straightforward system that's such a big part of their business.