I can't imagine why there'd be anything controversial about this statement, but I've been surprised before.
I take it to mean that the default position should be not to repeat who shared what in a room to anyone else who wasn't there.
I also take it to pertain to people both in and out of A.A. So I shouldn't tell someone who is not in A.A., "gee, Bob Smith came to the meeting last night, and this is what he said..."
But it also means (for me), that I shouldn't tell someone who missed the meeting last night but is normally there, "gee, John B. came in last night and told the group he was thinking about drinking again..."
I dunno, am I wrong here?