Apple's idea behind their App Store is that every app is reviewed to make sure it's up to their standards. They also provide a myriad of built-in UI elements and a Human Interface Guide that is supposed to direct developers in the design of their app interfaces.
One could postulate that Apple can fix third party apps by altering the available UI elements and interface guidelines. In fact, this type of alteration was done for iOS7 to guide developers into updating their app aesthetics to match iOS7.
Tagline to the blog: "We love Apple. We think this is the best way to point out what's not up to their standards so they can fix it." (emphasis mine)
Do they expect Apple to fix the UI of other people's apps?