Basically, read it as "you should kill yourself if you're not exactly where your ancestors lived 10000 years ago". That's what these people seem to think, they just don't want to say the quiet part out loud.

I live in a country where we have a very large amount of Russians, many of whom completely lack citizenship because they moved here during the soviet occupation so didn't get automatic Estonian citizenship after our independence, but also haven't gotten Estonian or Russian citizenship after the fact. This number has decreased over the years because most people have acquired some citizenship, but we still have tens of thousands with no state at all. I can't imagine simply deporting all of those people. In fact, we're now giving out citizenship to children of non-citizen parents who have lived in the country for at least 5 years, to avoid creating more stateless people. This is despite the fact that a lot of those people getting citizenship are also the descendants of settlers, with roots in a country hostile to our own. Those people's entire lives are here, who are we to uproot them just because we were here first? It's too late now.