But just to mention it, the database has a number of typos (like the one you cite), what is more important, it has a big number of more serious errors - the monuments which are still protected by law and included in the database but do not factually exist. The point is that this is not so much an obstacle for running WLM, since hardly anybody would provide monuments of non-existing monuments, and if someone would, this could be a major success. (I think if we could collect in such a way free images of wooden churches burned in Arkhangelsk Oblast in 1970s-1980s it would be great).
Yes, I know about the base. That's why we started after proposition of restriction of the territory only (and we choose the city which we could check), that's why we have disclaimers and prooflinks on every page with lists. And we have not received an official response from the Ministry of Culture with the momre correct base, although we did the request.
On the other hand, the FoP is a real issue - the images which violate FoP are subject to deletion on Commons, and you do not want a new user to start his/her participation in Wikipedia with a deletion review notice on his/her talk page. The fraction of non-free images is obviously small, since most of the monuments of cultural heritage protected in Russia were created before 1917 and thus are PD-RusEmpire. I believe (but did not check) that this fraction is even lower in Saint-Petersburg.
This is what I mean when I speak about task for jury - attempt to trace and explain; the most violations of FOP from participators in ru-WLM I see for those participators who upload monuments that not from the base, without a correct ID (who use ID like '1' or smth like this). I hope that everything will be alright in the end, the problem is not so large in scale.