Hello again!

As I said I do not blame you personally, but rather the preparation by your employer before assigning such a task. This is kind of special knowledge that would become obvious after getting in touch with the local community.

Concerning VBN Fahrplaner: No, that application (both the app and the website) do not use PT stops from OSM. Only the map and some POIs are derived from OSM data.

Have a good one!