Is this supposed to be a "the world has turned into shit" take, even though it's been like this for ages (way before the 4chan poster, or anyone alive for that matter, was born)?
Yeah, this is a common fascist recruitment tactic. "The world has gone to shit, things were better before."
This is the call to return to the golden past, a perfect time before "they" took it away from "us." In reality, as you point out, that golden past never existed. However, once people have it framed in their minds that their chance at utopia was "taken" from them, there's almost nothing they don't feel justified in doing to take it back.