The criteria clarifications offer plenty of insight on how Niantic views these.
Controversial Memorial Sites
Places that eulogize slavery, racism, or other acts of oppression and portray them in a positive light are not eligible and should be rejected as sensitive locations.
These stones don’t portray the events of 40-45 in a positive light, so they’re not sensitive locations.
Sensitive memorial sites that do provide educational value may not all be considered eligible, however. For example, places like Auschwitz-Birkenau may provide a lot of educational value through their museum and programming, but are also active sites of mourning. As a result, they should be rejected as sensitive locations out of respect.
These stones are very much not an active site of mourning. So again, they are not sensitive locations.