More "guesswork" here. "Guesswork to some extent is also right and can also just be improved upon. The user seems to take local survey data into account. " Laughable. Guessing and "seemingly" untracable "local data" then is the new background  for OSM? Even if there in any local data, it would be illegal, as the area is closed. If the data is from official sources, they have to be named. If not, they are not valid. 