With the caveat that Robert Morrow is a card-carrying LBJ-did-it fanatic, here is a discussion at the Ed Forum:
https://educationforum.ipbhost.com/topic/31081-breaking-news-cliff-carter-who-was-a-close-friend-of-lbj-from-1937-1971-thought-lyndon-johnson-murdered-jfk/You will note that even some of the most reputable CTers express skepticism. Pat Speer, whom I highly respect, dismisses it as "almost certainly fake."
One perspective I have that many others don't is my L-O-N-G involvement in other areas of weirdness. Just taking the 1947 Roswell "UFO crash," you would not believe how many bombshells like this have gone poof. Films, videos, hard evidence, seemingly sane people with no obvious agenda telling highly convincing whoppers. Some of the very best researchers have been led astray for YEARS before they had to admit the embarrassing truth. I really don't know why people pull these stunts, but they DO - again and again.
My philosophy these days, across the board, is "fake until unequivocally proven otherwise." Too many sincere researchers have been burnt too many times to have any other philosophy.