Where did you get the "there is no reality out there, it's all just human-created abstraction"? Which book exactly? Because I can't remember a single one claiming that. Maybe 'Simulacre et simulation' has a point that's close to this, but it's about consumption and signifiers, and certainly not about 'all'.
I don't think I remember anything from Lyotard about that, he talk mostly about legitimation and fragmentation. Weirdly, the only place I could see him talking about 'all just human-created abstraction' is in his criticism of metanarative (and in this case, replace 'all' by 'metanarative' and it's pretty close, but also very obvious).
Foucault isn't a postmodernist (he predate them), but he might have talked about that, I remember him talking about objective truth not existing, but it was in the context of words' meanings, and while a Canadian dumbshit took his words outside of its context, it's quite clear it's not about the physical world, but about meaning. Said Canadian proved him somewhat right by misquoting him on purpose. Also it's clear he lacked Wittgenstein's insights on how we describe reality , I would have loved to read Foucault with analytical philosophy insights.
Derrida, I don't know tbh, I don't think anybody but himself understands him, but I do not remember him writing about anything but art or philosophy.
I've read all of the ones you mention (except for the novel, I haven't read anything by that author).