The wording of that message wiggles around a lot. When you read it again, you realize there can be:

• almost every monitoring of online communications (just not ‘general’)
• all chat scanning (just no chat ‘control’)
• everything can be detected (just child abuse will be searched for AND detected)
• sneak peaking at everybody’s chats is ok. (But ‘detection orders’ need a thorough process)

This is the language of some one who knows is guilty