I went to your link and see that it also sh*ts on the Charles Adams book. When I read the Adams book, I couldn't believe the things I was reading. But I went back and forth between his book and others I own, mostly the Encyclopedia Britannica, and almost everything was corroborated. The one claim he made that I still have a little difficulty with was that Lincoln ordered the arrest of Justice Taney. He probably footnoted the book by the then Mayor of Baltimore, and I bought that book along with a number of others footnoted. To be sure, Mayor Brown backs up the Adams assertion, but I thought he provided little evidence of his own; so I still don't know about the Taney arrest warrant. But the Adams book is SPOT ON.
ML/NJ