Just so we're all on the same page, they're applying their own pre-stated rules to people all over the world. I'm not advocating that what they're doing is right but lets not make things up.
Nobody is making anything up.
I am not sure why everyone keeps believing this lie.
There was no rule that banned political statements.
Instead the rule was something like "we can ban anyone for doing anything that might make blizzard look bad".
It was absolutely not some specific rule about banning political statements.
The pre-stated rules don't talk about politics but about offending users.
So, ok, let's say that political statements are offensive, which is a weird proposition.
This is not being enforced for other political views and statements, nor for all users, so clearly it's not applying a pre-stated rule.
I feel the backtrack blizzard did can be considered a fair excusation, and people could reasonably forgive them, but let's not lie to ourselves by treating this as "just applying the rules".
That is imposing China's rules. There is nothing illegal or even offensive about naming your gaming account "FreeHK". (Battle.net has plenty of political account names; seems like half the people in my Overwatch games are named Trump2020, and they're probably not talking about the Starcraft/Hearthstone streamer.)
Edit: I did go to actually check, and this account is currently #2 and Asia and North America, and #1 in Europe. Clearly Blizzard is aware of it, though, and has chosen to take no action.