Unable to answer "What’s the surface here?" – Path – https://osm.org/way/1066177807 via StreetComplete 57.1:

This path does not exist anymore.

Picture shows
-Neubauweg
- water fountain on the other side of the fence
- locked gate on the far end

The gate makes the water fountain inaccessible to the general public. (But you can easily climb the fence or gate)

Attached photo(s):
https://westnordost.de/p/225047.jpg
https://westnordost.de/p/225048.jpg
https://westnordost.de/p/225049.jpg