Unable to answer "What’s the surface here?" – Cycle Path – https://osm.org/way/839947523 via StreetComplete 58.0:

Also foot path, asphalt

Attached photo(s):
https://westnordost.de/p/219761.jpg
https://westnordost.de/p/219762.jpg
https://westnordost.de/p/219763.jpg