My concerns are primarily with supposed path from https://www.openstreetmap.org/node/419666364 to https://www.openstreetmap.org/node/3072129948

Google is not allowed as a source. https://wiki.openstreetmap.org/wiki/Google

Even if it was allowed as a source they don't show whether the "tunnel" is passable.

I coudn't find any information about a passable path in your other sources.

If possible please use Mapillary https://wiki.openstreetmap.org/wiki/Mapillary or an alternative https://wiki.openstreetmap.org/wiki/Street-level_imagery_services to document the nature of the tunnel and whether or not its passable. 


The "fictional mapping" flag is applied by a Mapbox algorithm and doesn't automatically mean something is fictional.