From Wilkipedia:

"He (Jimmy Carter) attended Georgia Southwestern College and Georgia Institute of Technology and received a Bachelor of Science degree from the United States Naval Academy in 1946. Carter was a gifted student and finished 59th out of his Academy class of 820. Carter did some post-graduate work, studying nuclear physics and reactor technology for several months at Union College until his father's death after which he resigned his commission."

Based on that piece of biography, Mr Carter would be the first to appreciate the difference between plutonium or enriched uranium based bomb development processes. Even if he was not aware of the AQ Khan meanderings while he was negotiating in North Korea, it would be clear to him now that he and the Clinton administration were duped. So anything he writes today that does not recognise this actuality, even in hindsight, is but political revisionism. He was played and he would know that better than anyone.