The path exists and therefore will remain on OSM as per the ground truth policy. I have added the tags informal=yes and trail_visibility=horrible to reduce the path's emphasis in apps used by the general public such as AllTrails and Gaia GPS.

If you're worried about the cabin, I recommend reaching out to Metro Vancouver's Water Department (LSCR@metrovancouver.org) to have it removed and have warning signage added near the embankment.