Everyone who has visited the Kazan Kremlin WHS will also have passed by 1 of the 2 locations of this new TWHS, as the university building lies within the Kremlin. It will be a double entry if it is inscribed. I did not enter, don't know if you can.
I think it is not a double entry (if inscribed). At least it is not within the core zone of Kazan WHS. University area where the observatory is located, is two blocks away from the protected area. I hope I understood it correctly because the maps on the nomination file are not very clear.