iOS background wake on password protected device

In Apple Doc Understanding When Your App Gets Launched into the Background says When password protection is enabled on the device, the system does not launch an app in the background before the user first unlocks the device. Users cannot keep unlocking there iPhones after every few minute that some app will wake in background. How an region monitoring app will wake in background and do its stuff when an password protected device will not let the app launch in background? What is the meaning of that is written in Apple doc?