Apples and oranges.
Teaching tricks and trying to break a terrified reaction to external noise are very different.
I have read and watched and talked to trainers about my beagle's response to fireworks. Nothing has worked so far. I live across the street from Cherry Creek and we often walk within earshot of the rifle range. It doesn't bother Popcorn at all.
Some asshole just shot a rocket that exploded next to my home. Pop jumped off the bed and pissed on the carpet.
It's not as easy as you claim, whisperer.