It is impossible to speak about any destruction of Vilnius Jewish cemetery for it was demolished in 1950's by the Soviet authorities. The Sports Palace was built in this place. Although some fragments of the cemetery accidentally survived beneath the ground, they are not cemetery anymore (monument to commemorate the former cemetery is built there) and these are not threatened by any destruction. The area under discussion is purely hypothetical. A new building, according to some historians, partly occupies the edge of the Jewish cemetery, which was appropriated in 1831 by the Russian government and included into the fortress of Vilnius. An approximate plan made in the year 1808 is the main source for such an assumption, though there were no undisputable archaeological evidence found in that place (the scholars who believe that the cemetery was there doubt the accuracy of the investigation). I don't think that dispute over the supposed boundaries of the Jewish cemetery prior to 1831 has anything to do with the "destruction" of Jewish cemetery.