I will have to do some research into this: is it true, and if so, what is the motivation?
I've been told the concern is legal, basically so no one involved is called into court.
Several years ago I assisted with a recovery, it was the one AJ says no report was released on (he did wet work, I did dry work). It was a real messy deal, diver had a heart attack in a cave, another diver (an instructor with a student) that ran into the victim during the incident tried to rescue but couldn't, however he managed to save the buddy and keep his student safe as well.
A few people, including the former training director for the NACD, got on social media and said they could have saved the deceased. The deceased had over 60 minutes of mandatory deco and was 800' from the exit when he died; even if he could have been brought out, he couldn't have been revived before dying from explosive DCS.
About a year after that incident, the coroners report came out and said there was no way the victim would have survived the coronary.
Now put your shoes in the guy that tried to rescue someone in a cave and couldn't, only to be victimized by a bunch of people on social media that weren't even there.