see https://commons.wikimedia.org/wiki/Special:MediaSearch?type=bitmap&q=Matterhorngletscher the file File:Aus der Hörnlihütte.jpg is the result of a rename, as the name and the description have been wrong. But it is still found by MediaSearch, although as far as I can see, only the redirect could be the reason for that.
Sometimes a file is renamed, because the name indicates the wrong thing. After such a rename, MediaSearch should not find the file by the old term. I would skip the evaluation of redirects / renames from MediaSearch, as there always should be a reason to rename, renaming normally is a refinement, and SDC are not touched automatically by a file rename.