Hoi - The outdoor measuring station passes on the outdoor temperature for the app or the thermostat control (or the backend) - if you want it to. Otherwise, it has no functionalities that somehow "enable" the link or that would be useful (the thermostats measure themselves, independently of the indoor station(s) of the weather station). About the app: Respectively the apps: There are two separate apps for energy (thermostats) and weather (also) on Android and iOS. There is also a web interface that contains both functions, but in a separate form (weather: the weather jackets and click on energy: the heating data and control of the thermostats).
TL;DR form: Conditionally Yes and No...
If you have any questions, ask, Hope that helps and LG