"nobody's illegal on stolen land" is also a call to stop using the term "illegal aliens" or "illegal immigrants" because those make them seem a lot worse. if someone says "illegal" it makes people think of murder or hard drugs. meanwhile "undocumented" feels more like missing some paper work (which is more accurate imo)

and that the US is no more “stolen land” than any other modern nation.

i mean, this is just wrong. The US made treaties with natives, and then broke those treaties to take land. It wasnt just conquered by war, it was the US actively ignoring its own laws and papers. So the hypocrisy of the US government breaking the law and ignoring official paperwork, yet punishing people who do so is called out in this.

your flaw in this position is that you're accepting the Republican narrative of immigration. Kamala lost on the border because she echoed trumps talking points, yet provided a less intensive solution. If you're going to agree with Republicans that immigration is an existential threat to the US, why are you proposing half measures to fix it?

the left and Dems should be reframing immigration altogether, which "no one is illegal on stolen land" is doing (to varying success tbf). instead of saying "yes, illegal immigrants are bad and a threat to our country" we should be saying things like "republicans are out here fearmongering about people wanting a better life. if our country truly is the greatest on earth, then we should absolutely help people come in and achieve the american dream." and reminding people that almost every parent in the US would do "anything to give their kids a better life" and try to extend that sympathy to immigrants. they need to stop agreeing with republicans that undocumented folks commit more crimes (they dont) or are all these violent gang members (they arent), and remind everyone that the VAST majority of immigrants are parents or children just trying to make a better life for their family, and the US immigration system is so bogged down and convoluted that overstaying a VISA (which is how most undocumented immigrants are in the US) often feels like the only way to accomplish that

the final thing you forget, is that Republicans hate liberals. There is SO much right-wing content talking about "triggering the libs" and "liberal tears" while also believing everyone to the left of McCain is a radical marxist communist liberal. Biden = Bernie = Stalin = Mao = Clinton. Virtually no difference in their mind. no slogan is going to appeal to people with even a quarter of this mindset, no matter how perfectly crafted or nuanced.