Blitzchung got a worse punishment than people who got caught cheating at Blizzard games. I think that says a lot about where their priorities are.
Based on past events (even Blizzard's own presentations at Blizzcon) it's already clear that the rule against offending people is being selectively enforced.
Edit: And I'm presuming it's being selectively enforced based on who is offended by a statement.
This is a very generous (towards Blizzard) interpretation. The rules weren't "no politics". The rules were a generic "don't piss us off or do anything we may find objectionable", basically.
Per the Verge, 'The rule in question forbids players from doing anything that “brings [them] into public disrepute, offends a portion or group of the public, or otherwise damages [Blizzard’s] image.”'
It's designed to be arbitrary, because if you were to strictly enforce it anyone would violate it simply by existing nowadays.
It included we will defend the honor of the nation, making it clear exactly what he did wrong.
If blizzard thinks that they said something wrong, then the burden is on blizzard to correct the matter.
Really? Like...that's a thing you honestly can imagine?
What we can say is that the operator of Blizzard games in China, Net Ease, while posting about this incident under a Blizzard branded account, said that they would protect and defend the pride of China. Blizzard has not distanced themselves from this statement, "clarified" it, or done anything whatsoever to indicate that this stance is not the truth.
When someone you have authorized to represent you is making a statement in your name, it will be taken as being endorsed, unless you state otherwise.