Nobodys claiming no group of people lived in Denmark, Hungary, China, etc for 999+ years.

They're claiming none of their governements is over 999 years old.

Denmark's constitution is from 1849 [1].

Hungary's constitution is from 1949 / 1989 [2].

China's government is form 1949 (when the previous government got overthrown and went to Taiwan) [3].

I'm not going through the whole list.

[1]: https://en.wikipedia.org/wiki/Denmark#Government_and_politic...

[2]: https://en.wikipedia.org/wiki/Politics_of_Hungary

[3]: https://en.wikipedia.org/wiki/Government_of_China