Oh, curious. I guess the data used by openrouteservice.org might be a bit stale. There was an edit three weeks back: https://www.openstreetmap.org/changeset/95556786 "the section is practically impassable, this is no longer a road"
That graph just says they didn't bother cutting through the hills make a nice easy grade. The resolution isn't fine enough to tell you whether it's a potholed mud pit or graded gravel.
