Putting yellow X made of "police line" tape houses would be indeed a sign of thoughtfulness if the styles of Kosovo Serbs and Kosovo Albanians were indistinguishable by architectural styles.
But they look completelly different. Albanian houses have the look of fortified compaund, Serb houses does not.
Putting a yellow X mark on Serb house is like putting a mark on a black horse to help distinguish it from a white mare.
Since you claim to have been stationed in Kosovo you know that, but you have chosen to deliberately mischaracterize Ms. Gavrilovich's remark.
Don't worry, the truth is coming out.
There are still some old "kulla" around, although most were blown up or burned by Serbs in 98-99. For most houses in Kosovo, you cannot tell whether a Serb or Albanian lives there, especially in the villages and towns. Of course, a good way to tell the Albanian houses in 1998-99 was to look to see which ones had been shot up or set on fire. And ditto for the Serbs after the Albanians returned. Hence, the yellow tape.
The Germans were doing the best they could to identify Serb dwellings so they could protect them; but with paranoia like yours, I guess its d*mned if you do and d*mned if you don't.