The authorities are, understandably, not releasing it, but it would be VERY helpful to see the “distance arcs” derived from EACH of the hourly pings. Comparative Analysis of that information on the different arcs could very possibly lead to more precise locations.
The various intelligence agencies almost certainly have more information than they are releasing. Depending upon the scenario, the authorities could actually be releasing/leaking incorrect information to mask what they really do know.
Someone is holding back info...and they may think its for our own good...
I agree 100%. This information is surely being withheld intentionally. It would, as you state, narrow the search to a very small target area. The Big Guys know where that search area is and are certainly keeping it secret. I'm betting it will leak out. Whatever area it is must be receiving a lot of attention. That focus will be noticed. Keep your eyes open and your ear to the ground.
And, by the way, any interested party could plot those points assuming that the author of the article is correct about the routes and the air speed.