I have never seen this film, and I’m not sure I want to see it either, as it seems to consist of humour that makes you excruciatingly uncomfortable at the same time as being funny.
Of course the premise is unbelievable: it is economically impossible for a state with significant chattel slavery ever to develop the (relatively) high wages that provide a major incentive for the development of labour-saving devices on a large scale. In short, human labour power never loses its comparative advantage, and any industrial revolution is stymied — capital is never properly substituted for labour. That’s one of the reasons the South lost: despite ‘Johnny Reb’ being — on the whole — a better soldier than his Union counterpart, the North had the industrial base, and quite literally produced the South into the ground.
That said, just the trailer is disconcerting enough, never mind the whole movie…
A useful definition of squick, for those interested.