I owe you a fuller response to this than I can probably dash off just now, but I would make a few notes.
1) The "they" you identify here absolutely does exist and absolutely does profit from the two parties existing in the way that they do. But I don't think that's Graeber's "they" in the video (I mean the actual referent of his pronoun).
2) I don't regard the parties-as-they-exist as an absolute given--just practically speaking the only mechanism by which any sort of change is likely to occur. So, one thinks about the Democratic party's hope to get single-payer health care. Not even a particularly progressive aim, but for the US, progressive. And one watches what Obama was able to achieve, and how even something so meager as a public option disappears if you lose even one vote, and for me, that's a marker of what a
load left-leaning people have to move to get anything done. One doesn't even have to characterize the right as Nazis to see how hard a pull they exert against any meaningful reform.
Even as a centrist, I can
see all of the goods that would come from a more authentic progressive movement. I just can't
see it happening in the country in which I've lived out these fifty five years of my life.
So when a guy in a video who chooses to present himself amid all the trappings of that "mishmash of bureaucracy" he so derides (comfy sweater, comfy chair, stylish lamp) lectures me on how Obama stands for nothing, it just rubs me the wrong way. Maybe this guy has progressive bonafides (had); I suppose I could go look him up. But the video itself wasn't the trenchant critique of centrism that
@Ironsided prepared me for. Hell, the average
@Lexicus post on this site represents a more impressive critique of centrism.