I worked with a DDoS protection provider briefly. Suffice to say, it's quite possible that being public with identity can bring a significant chance of physical harm. Dunno about this particular case, or China, but for other people offering services to that continent-area, they had real concerns.
> Due to the sensitive nature of the content on our web sites we prefer to remain anonymous at this point
If they want help they need to be transparent about who they are and what their objective is. One man's tool of diplomacy is anothet man's... etc.