Occam's razor: they might not have realised it was active the first time (or publicly available enough), and so disabled it this time (because they want to keep the location secret)? ie a simple oversight?
Thats mighty generous auraflyer. While not suggesting a conspiracy, I certainly don't believe many things have been left to chance in this whole process.
At one level I can understand not disclosing the location right now. It would inevitably promote more speculation about what caused the crash - while such speculation is happening anyway, I can appreciate they have no desire to encourage it. It would almost certainly generate criticism of the previous search efforts if they were seen to be fairly wide of the mark (yes such criticism would be unwarrented and would be ignorant of the substantial difficulties involved, but we all know that such criticism would be forthcoming).
I hope that this is the only reason, and that there are not other agendas at play. I believe we should give the authorities the benefit of the doubt that justice is being done. Equally, those authorities need to be realistic and understand that justice also has to be seen to be done. Fairly or unfairly, there are already plenty of questions being asked about many aspects of this investigation. Against that background, the authorities need to appreciate that the lack of of communication and insufficient transparency do not help this cause.
And I am still not convinced about the location. On balance, I suspect the graphic produced is honest. But the language used is loose enough to be ambiguous - possibly deliberately so.