I think this is a fair analysis, although I'm not really sure if it really fulfills the purpose of settler colonialism (which, from my perspective, is living space. In a literal sense it does give white people an advantage in literal space to live, but it doesn't give them an advantage in cheaper resources and petite landowning/Bourgeoisie property ownership.) But i honestly find this very convincing. (Edit: the suburbs and gated communities do help engage in stratification and alienation which might also help in solidifying the definition.)
On the tactics part, however, I would say it doesn't matter too much. Like you said yourself, the life is becoming more and more unstastainable for obvious reasons. More and more people who used to live in suburbs are either going to have their houses crowded when they can't afford living space, or move into traditional inner city homes.
My concern is what to do with them after a revolution. I mean yeah material conditions will change over that time (it's certainly not happening tomorrow) it's just...they're very artificial, but they are homes for people. Idk
I'm guessing its just hot air when it comes to Greenland and Canada (they're already fairly in the US camp, why rock the boat once he's in office) but I am worried about Panama. The US already invaded it before against Noriega, and Central America and South America has become relatively more independent and socialist in recent years.