They aren't saying that the email/number is part of the message. What the are saying is that they are able to decrypt the logs in order to identify the senders .
It could be they cross-reference matching some internal ids / tokens / physical addresses of the devices together with all the data the Chinese government already has (or can obtain) ...or it could be a bluff.. who knows... there's not enough information, and what we know is probably distorted.
Yes... how is "reducing exclamation marks" a good thing when you do it by adding a
'
(not to be confused with,
´,
‘or
’` ..which are all different characters).Does this rely on the assumption that everyone uses a US QWERTY keyboard where
!
happens to be slightly more inconvenient than typing'
?