MH370's final location could be near S35.672 E92 (if one believes the Investigators)

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I used Inmarsat's 7th Arc image to estimate that the radius of their circle was 2629.4 nmi (nautical miles).

I now estimate that the intersection of the due south flight path is near S35.672 E92, if one believes the Investigators. This latest image is an update to my original post on this topic, which can be read here.

Inmarsat has stated:
"We can identify a path that matches exactly with all those frequency measurements and with the timing measurements and lands on the final arc at a particular location, which then gives us a sort of a hotspot area on the final arc where we believe the most likely area is," explained (Chris) Ashton. (Source: The Guardian)

Yet despite Inmarsat's certainty of their precise final location of MH370, and despite all of the Investigators hailing Inmarsat's analysis as accurate and verified, the Investigators didn't go to that location. Instead, the Investigators chose to waste 8 weeks searching an area where they detected underwater pings that were outside of the specification for a Black Box. Being the experts, they would've known immediately that those signals weren't from MH370.

China determined that the underwater signal that they had detected wasn't from MH370, within a day or so. So how is it Australia failed to do the same with the signals they detected?

Note: I am only posting this to update my original estimate of where MH370's final location might be, based on what the Investigators have stated as facts in this case, and based on my estimate of the Inmarsat 7th Arc Timing Ring. At this point, for me, there are too many discrepancies for me to believe the Investigators.