Article 8 of the European Convention on Human Rights says that you have a right to private and family life.
This has over time drifted to mean that we can't deport foreign violent criminals. This is not what people had in mind when the Convention was written and agreed to.
But now these ideological legal activists want to try and go even further, and say that it is also against Article 8 not to give foreigners citizenship in the first place. It is not a human right to get a European citizenship!
But unfortunately there is a decent chance they will get away with it, because our democratic tools to fight these Convention interpreters are limited.