It's become VERY obvious that you do not read a word of the "ORIGINAL" Report from DSB
So, if I were you, I would read the 2 reports, or the "Government Source" you said in your post First, then tell me exactly where the Report by DSB single out and cry foul on Chinese Hacking??
You can find the report here
Defense Science Board
under title:
Resilient Military Systems and the Advanced Cyber Threat
Cyber Security and Reliability in a Digital Cloud
The DSB report are on Cyber Safety, they just use Chinese as an example that they are the only capable foe of Cyber attack, (I believe the DOD called them Tier V) However, if you read the same report, you will also notice that US also consider Russia as Tier V Threat and provide example as such, but you don't see any of the news report on that.
The Origin of the Shitstorm coming from a Washington Post Article that written after the Australian Cry foul on US cyber spy. Then the writer also read the same report and pick the content out of the DSB report, and ignore the fact that the DSB report are merely on US focus on Cyber warfare. They choose those information they want and ignore the rest of the stuff and spin the story to sell paper, and then what you see is you get Al Jezzera, BBC and Chinese Newspaper all saying US Crying foul on Chinese Hacker.
LOL, if you are not stupid to believe the word on those News Media, I don't really know what you are??