and it means you GO BACK too, no one should give a fuck about which gen. you’re currently a part of.

This would mean that like 99.9% of Earth's population has to move somewhere. Almost all land was fought over endlessly and changed metaphorical hands multiple times over. What we call "indigenous people" in a territory is usually just whoever was winning those wars before written history began.

What "landback" actually means is recognizing the systemic racism that was and still is perpetuated against the indigenous people by means of taking away their ancestral lands, slaughtering and enslaving their ancestors, and destroying their way of life; and addressing that racism by giving jurisdiction and sovereignty over their lands back to them. It doesn't mean that everyone but the indigenous people have to move out; descendants of colonizers born there are technically natives of that land too. The difference is that they get systemic advantages from their ancestry whereas indigenous people get systemic discrimination. This is the thing that ought to be addressed. (well, the horrifying economic and governance system that the colonizers brought and festered must be addressed too, but all three are tightly coupled together)

In the case of Israel the difference is that a lot of colonizers are first gen, they are not natives, they do have somewhere to "go back to", and they are actively perpetuating colonization and genocide rather than simply getting an advantage from their ancestors doing so. In such cases it of course makes sense for the decolonization effort to focus on direct expulsion of invaders.