Three reasons I am hopeful this is real
1. They stressed there were multiple objects close by. That suggests they have not been in he water for that long. Over time objects will separate. There is not that much traffic in that part of the world. Wreckage from a tsunami will not still be floating in formation.
2. I continue to believe there was corroborating evidence that refined the Inmarsat data.
3. Aust PM has gone out on a limb. He has also put Malaysian PM under some pressure - if some theories are thrown into doubt, others become more likely. Not that this pressure on Malaysian PM was the purpose, but it is an inevitable consequence. So I believe he feels he is on strong ground.