Probably, the person you are responding to does not understand that "mng" in the URL means "Mongolian written in the Mongolian script" and did not guess either

Probably, the person you are responding to does not understand that "mng" in the URL means "Mongolian written in the Mongolian script" and did not guess either that the letters "MN" at bottom left meant "Mongolian written in the Cyrillic script". And why would they? The biggest surprise here is your answer, IMO.