http://www.ead.eurocontrol.int/eadba...2016-03-31.pdf
Section 2.4 Class D Controlled Airspace
Excerpt as follows...
"Service: Air Traffic Control Service
VFR: ATC separation not provided.
Traffic information provided on IFR flights and other VFR flights; traffic avoidance advice on request."
That is the service provided by ATC in Class D for VFR flights. The fact that radar-derived information is available does not change the service provided. All it means is that ATC has radar information available.