Pretty sure it's an incorrect date stamp. Either that or that website can read the future or has a time machine. There are multiple articles on this from 50 other sources if you want.
http://www.bbc.co.uk/news/world-us-canada-38141686
http://www.cbsnews.com/news/donald-trump-chooses-steven-mnuchin-as-treasury-secretary/?ftag=CNM-00-10aab7i&linkId=31719926
If that website knew about this in May that would make the whole thing even more shady, lol.