I always appreciate how the US are able to pin every network compromise directly back to China. And not just China but the Chinese government in particular.
Almost like VPNs, proxies, TOR, compromised machines, botnets, or similar do not exist in this arena and that a reverse DNS lookup will tell them 1337.mss.gov.cn.
When the US talk about cybersecurity/"cyber wars" in general they're talking about something more akin to a Hollywood movie than anything you see on the ground on either side of the "fight."
I'm extremely sceptical every time they claim Chinese responsibility. I am sceptical not because China wouldn't have the skills or motivation to do so (they do/would) but because they jump to these conclusions unrealistically quickly and if their adversary covered their tracks even modestly pointing fingers like that would be quite hard (e.g. send it through Russia).