To be honest, there is no proof that the developer made up false reviews. In fact, the description in the middle of the page states pretty clearly that this App

To be honest, there is no proof that the developer made up false reviews. In fact, the description in the middle of the page states pretty clearly that this App provides perceived notion of security and it's just a decoy. So what to take away from this? For one, 99% of AppStore users don't fucking read the description. In fact I would have bet that the only two things that made them bought the app what the icon and name.