Hello, this way is mapped since 2009. Also, in official NRW Atlas Liegenschaftskataster, it is white space. This means "public traffic area", so the farmer/owner of this land has to keep this free and a way. So this way definitely has to stay and can't be deleted. You are a new mapper and maybe don't know the "inofficial rules" not so good right now, but let me tell you: it is quite common that you will find ways in OSM that are badly visible or bad to walk depending on the season of the year. Fort this, you could classify the way with the according tags:
-tracktype (e.g. grade5 is worst)
-surface (you already mapped "grass")
-trail_visibility (but i can see it very good)
