That won’t get anybody anywhere. If you have knowledge of the trail, you could use it by tagging the trail appropriately, to your knowledge, and then data consumers should eventually take and process these tags - everybody benefits. Adding more data is a good thing!

Access tags can be added to show that the trail isn’t public, and as 0235 said above there are more tags for trail conditions. A lot of things on OSM start out with almost no detailed data to them with the intent of others adding more in over time

