I don't think there's any new theory in this. Like most normal Lost Cause stuff, it holds Lincoln to an impossible moral standard and at the same time gives everyone in the south a free pass on the issue, then goes to argue that the North was evil for "subjugating" the south while (again) simultaneously ignoring the fact that millions were held against their will in the south at the same time.
But it did make me wonder... if all of this was about taxes, why do the southern states talk about slavery in their secession documents?
Why didn't Lee march right into Washington DC after 1st Mananas and force surrender of the Northern Aggressors?
If slavery was going to die on its own, peacefully, why do you suppose Kansas was so close to becoming a slave state? Why do you suppose millions of cool-headed Americans didn't feel that way at the time?
If Lee and Jackson are so revered, why not Longstreet? This is a dead serious question. The guy that could've saved the CSA at Gettysburg had anyone listened, nearly without a statue anywhere...
Interesting that a Fallwell guy would call Lincoln a white supremacist, by the way.