The point is to not rely on a server to host anything though. That the QR contains the data itself, not just a URL pointing to the data. Otherwise it is no different from any other QR code that has a URL in it.
The suggestion, I think, is to put the code in the URL itself, not use the URL as a pointer.
You could probably use a data: URL to avoid needing a server at all, but if not, the server would just provide a launcher and not host the application code.
