Unable to answer "What’s the surface here?" – Foot Path – https://osm.org/way/374137916 via StreetComplete 58.2:

No path, grass.

Attached photo(s):
https://westnordost.de/p/224232.jpg
https://westnordost.de/p/224233.jpg
https://westnordost.de/p/224234.jpg
https://westnordost.de/p/224235.jpg