Hi,
what shows in the report is defined by the input to the report task:
<structure name="com.hp.ssmc.pianoui.BaseTest.RemoveSystemsTest">
<classfiles>
<fileset dir="ServerTests/build/manual/classes" />
</classfiles>
</structure>
If you want to restrict the report you may want to restrict the fileset in the structure element.
As a separate aspect I wonder why you use offline instrumentation. This is not required and not recommended. The coverage task will do on-the-fly instrumentation for you.
Regards,
-marc