Other than adding buzzwords to a features list, I don't see AI really moving the needle here. As you've said, it's always been the expectation that employers are watching over their networks.

There's already loads of monitoring software available that can scrutinize, categorize, and track everything going through corporate networks. A company I worked at ~20 years ago had an internal website showing a live display of URLs accessed through their whole network, a "top 100" list, a break down into categories (news, email, games, etc.) and other stuff along those lines. They were absolutely categorizing and scrutinizing everything way back then, no AI needed.