Ian W
It is extremely unlikely that the person(s) flying MH370 were aware of the SATCOM tracking that could be done, therefore it is also extremely unlikely that they were spoofing the tracking.
If we assume that the disappearance was deliberate by person unknown, then after 1 year of not finding one single scrap from the aircraft, one can also assume that whoever did so was aware. He would have gone through every possible scenario of a search operation. So far he has succeeded.