Indeed - seeing the level of sophistication and long term thinking behind this attack, it seems everything about it was planned meticulously, including username

Indeed - seeing the level of sophistication and long term thinking behind this attack, it seems everything about it was planned meticulously, including usernames, attack vectors, communication with the community, and when to commit the parts of the exploit. There's probably a full team of people behind it and attributing it to China because of the username may be too quick.