Unable to answer "What’s the surface here?" – 2 (Path) – https://osm.org/way/529230160 via StreetComplete 63.0:

Brücke mit Gitter, dahinter Stiege mit 10 Stufen

Attached photo(s):
https://streetcomplete.app/p/337571.jpg
https://streetcomplete.app/p/337572.jpg