I don't think the KJ21, contains any other books outside of the KJV. The Millennium Edition, is the only one that contains the non-canonical books. As far as I know?.
No it's not a true KJV, my comment was that anyone that had no problems with the Scofield 1967 KJV, would have none with the KJ21. At the worst, at least, it has no doctrinally slanted editor notes.