It's just BS. Privacy and security are OS functions, not part of an app store. iOS has a good base here already - certainly much better than windows where every app can just arbitrarily read every file on the computer...
Naive take. Network sockets, remote servers, and data brokers don't care about local file permissions and an OS won't be able to tell me if corp-surveillance.justbuyme.com might be a domain hosting a privacy-disrespecting service without some sort of human-mediated reputation service.
Then we can look forward to an exciting front in the arms race that is computer security. Surely Apple, for all of their engineering and design brilliance, are up to the challenge?