If true this is a giant failure of Chinese intelligence. It just shows how far ahead the US is that they're able to charge specific people. The PLA needs to upgrade its capabilities if they don't want to stay an embarassment.
I think this situation shows more the incompetence of the US cyber security apparatus, at least when it comes to securing critical systems.
With the OPM breach and the Equifax leak the Chinese have the personal details and biometrics of millions of Americans who work for the government in areas that handle sensitive information.
The Russians have already specifically identified US cyberwarfare individuals before. So, it can be done and has been done. With the information the Chinese already have it is very unlikely they could not do the same, but they'd gain very little from it. (The US doesn't gain much and should probably stop the practice also.)
I don't see where your link points to this and I mean it's pretty obvious the Shadow Brokers were aligned with foreign policy interests of the Russian government. If it was another adversary, I don't see why they worked so hard to benefit mostly Russia.
It doesn't achieve much, it increases the risk of revealing methods and sources. It also puts US cyber security personnel at greater risk, some of whom have spoken out against the practice.
