They don't actually make clear where the information has been deleted from. But to me it sounds alot like the big fuss at the inauguration when Obama's Whitehouse website was archived and replaced with Trump's.
The stated 'The US National Strategy for the Arctic' and 'Implementation Plan for the Strategy', both sound like Obama policy which would have subsequently have been archived.
Blaming Trump for this is facile at best.
http://edition.cnn.com/2017/01/20/politics/obama-white-house...