I think it’s open knowledge in the Federation that particular aspects of Jin-Mei culture such as its caste system are incompatible with legal stricture in the Federal charter and constitution.
However, the Federation has moved past from the interventionism in member state affairs that characterised its early years. Present trends in power sharing between Federal government and member states has been towards more devolution and autonomy for member states.
This has lead to greater cultural expression within the Federation and furthers diversity in thought and opinion of the wider Gallente milieu. I see no deception on the part of the Jin-Mei or indeed the Caldari, Mannar, Intaki, and Matari of the Federation who desire to practice their traditional culture while enjoying the benefits of treaty to the Federation.
After all, it should not be the role of government to enforce cultural homogeneity over its own citizens. Such totalitarian thought is best left to the tyrannies of State or Empire.