Yes, I believe Kilmeade is just a talking head. The ones behind the content of the series are O'Reilly and David Fisher.

Book-
https://www.billoreilly.com/p/Legends--Lies:-The-Civil-War/Legends--Lies:-The-Civil-War/48684.html

Sometimes the bias is so bad it's amusing. Compare the soft-spoken, saintly Lincoln to the loud-mouth Jeff Davis.