I have heard explosions and being in the countryside I hear distant sounds all the time that usually are just dynamite, shooting practice or hunting. As you know there is high gun ownership here.
However, were I to be asked for a witness statement I would try to describe the sound rather than attribute a cause to it, if I had not directly seen it or witnessed the cause.
Altti Hakanpää actually does use the much stronger term, 'explosion':
IS, 2019
'I was in the karaoke bar with my friend, when I heard an unusual sound. To me, it sounded like an explosion. I immediately lft. It was seconds or minutes in question that I got out. Then there was a rapid list (fall) of the ship and no-one there came to help'.
Why do you believe the guess of the JAIC is more reliable and credible than
a survivor who was actually there?