I think its possible to take a stronger position as the roots of the modern idea are definitely pre-modern and not significantly influenced by ancient Greece. Democracy and human rights evolved together. From things such as the Witan and the moots in England ( https://www.parliament.uk/about/living-heritage/evolutionofp... ) and traditional laws that were gradually extended over time (the Magna Carter, for example). Similar histories in other countries too.

> reeks of Blut und Boden

Definitely linked to that sort of thinking. It sounds very inspired by 18th/19th century ideas of race (the ideas based on science that was debunked by the mid 20th century and has been thoroughly disproved by genetics).

The problem with these sorts of arguments is they take little bit of truth and some real examples (there are societies with politics is very tied into ethnic identities, there are groups defined by culture and language that want their own states) and treats them as the norm.