Let me take a stab at creative government-speak:

No, this is also metadata. They are only taking a screenshot every few minutes, with as aim to get a clear picture of the face of the person operating the computer. Just like an email header contains a From-address in the content that's metadata, a webcam session contains the same metadata in the form of these screenshots of people's faces.

They're not collecting the data, i.e. the moving webcam video + voice. They have no idea what's being said. Just metadata.