In cases where we suspect that there is something problematic, we can monitor. To me there is a difference in saying supervisors have the responsibility to monitor and saying that the university has the right. I don't find this statement in the actual policy. This appears to be an interpretation of the policy which is particularly troublesome. Personal use statement says it is acceptable, but presentation says with supervisor approval.
HR attends to put our much more draconian interpretations than the actual policy.
The level of monitoring that we're talking about for a supervisor, you would want to delineate your need to do that. In some areas phone conversations are monitored. In those cases, staff members are notified in writing. You may want to monitor in the case of investigations. In that case, the statement is overly broad.