Unable to answer "What’s the surface here?" for https://osm.org/way/446443332 via StreetComplete 55.1:

This trail does not seem to exist. Only the fire roads seem to actually exist here. Does anyone even know where these supposed trails came from?

The fire road is a small dirt trail suitable for an off-road vehicle or walking. It's signed as the end as a fire road, and looks to be mapped accurately.

Attached photo(s):
https://westnordost.de/p/197769.jpg