ByRule wroteRaymond is correct.
NCAA M and NFHS are different- NCAA M changed rule on a deflected ball by the defense while the ball has front court status anyone can retrieve if the ball goes in the backcourt. Regardless of last to touch first to touch.
In the OP (and based on subsequent posts) the ball *may not* have been in the FC when it was deflected -- so, based on this (and my subsequent reading of the rule), it may still have been a BC violation (depending, perhaps, on the loss of control / dribble issue).
In any event, if it takes all this to decide, then the official was correct -- no matter what the zapruder film shows. 😉