This is embarrassing because the comment for v8 of the object seems very clear, and the user is generally very reliable when dealing with access permissions in the forest.
https://www.openstreetmap.org/way/40224710/history

I tried to look at Mapillary pictures on both ends of this path, e.g. https://www.mapillary.com/app/?pKey=683305516015215 but couldn’t find any sign with a legal restriction or anything stating it is primarily for horse-riders.

How can we process further?