I am more inclined to think that there was an in flight detonation of some type. It is just too coincidental to think that there was a threat 4 days before then a plane goes missing.
The threat was in a different country. There are very frequent threats about bombs on commercial flights. Most we never hear about, and all have turned out to be hoaxes. We only heard about the one in Argentina, because of the unexplained Air France crash 5 days later. Until that, the Argentina bomb threat, and subsequent 1.5 hour delay of the flight, was so routine as not to be newsworthy outside of the Buenos Aires media market. And it's still not worth paying attention to.