Whining about States rights to enslave people is certainly a take.
Particularly when in context, the war was caused by the South acting to usurp abolition in the North via the legal system (i.e. Dredd Scott https://en.wikipedia.org/wiki/Dred_Scott)
The importance and applicability of "states rights" is always oddly narrow.
The Confederate Constitution was mostly a copy of the US Constitution. One place where it differed is that it forbade any state from abolishing slavery. So the whole "states' rights" thing is obvious baloney.