Here was a beginner, more precisely a-Hit-and-Run-Mapper (a total of 8 changesets on 2023-07-10) at work. Besides surface=kies, there are other typical beginner's issues, such as descriptive names, comma as decimal separator, or specifying the unit of width in "meters".  
I have corrected the things in question myself [0] since the user had apparently lost interest in OSM after 1 active day.  Surface=fine_gravel is the usual and most probable material for built-up, unpaved footpaths within towns.
Best regards, geow
[0] https://www.openstreetmap.org/changeset/140736993