Windows must be prevented from using Windows Update to search for drivers.
Some features may communicate with the vendor, sending system information or downloading data or components for the feature. Turning off this capability will prevent potentially sensitive information from being sent outside the enterprise and uncontrolled updates to the system.
This setting prevents Windows from searching Windows Update for device drivers when no local drivers for a device are present.
How this relates to the STIG checklist: STIG vs SCAP benchmark.