I fail to see anything of substance here, seems to be some person with a chip on their shoulder. Apparently the word cosmopolitan is a derogatory dog whistle for Jewish person, but why would an antisemite name their own work after something they do not like?
Just to be clear I'm not talking about Justine here and I consider the project to be well within the normal meaning of "cosmopolitan", but dogwhistle names are absolutely a thing antisemites do.