It appears to be a coincidence that the published bands cross over the last known location of the plane, by the way. Had the plane continued toward China, for example, the bands would be much further out from the satellite’s location.
I would like to see the data these techs used to draw their conclusions. Without that, it's just another theory with graphics....
There are two aviation forums that you can read without signing up. Both have incredibly long threads on this flight and have covered all of this.