I mean, I gotta be honest, I don't personally consider it worthwhile to engage with accelerationists. The definition of the ideology is that you want to allow and encourage societal collapse and mass increase in suffering in the hopes that it will lead to a revolution and usher in your chosen policy goals.
As I suggested in PoliGAF when this came up last time, my major objections to this proposal have nothing to do with feasibility, I just think it's fascist and evil. Like, literally supervillains in comic books have plans to do stuff like this. Also Hitler. So when people start arguing for it on internet message boards I tend to treat it the same way I treat anybody who starts arguing for any other form of mass murder.
It's also true, however, that there are no examples of this actually working. Actual failed states don't lead to progressive policies. Like, ever! They universally lead to further right-wing policies, because they lead to authoritarian governments. For example, I would point to literally every communist country ever founded. Or like any introductory history to the twentieth century. Or the French Revolution if you're nasty, I guess.
So, like, as always when people start suggesting things that are both evil and unworkable, it's best just to assume that they're trolling. Because the alternative is worse.