The link you tapped contains a link to geodata. To view this geodata on a map you have to do the following:

1. Install the free Topo GPS app (iOS, MacOS and Android) from the AppStore or Google Play Store.
2. Tap on the link again. Either the Topo GPS app will be opened automatically or a pop-up will appear in the top of your web browser. If a pop-up appears, tap ‘Open in Topo GPS’.
3. The geodata will be displayed on the main map.