GB;
I am suspicious of both the DeltaNW event, and the NTSB release.
Also, with reference to the A330 QRH "UNRELIABLE SPEED INDICATION/ADR CHECK PROCEDURE, for Cruise between FL200 and FL360, the N1 setting, (Trent installation) is 69.6%, pitch is 2.5deg; above FL360, N1 required is 77.2%, pitch, 3.0deg.
The comment in the informal "report" first posted states that the crew used "83%N1". The lower N1 referenced in my QRH may be due to engine installation but shouldn't otherwise vary. I believe Delta A330's have the CF installation however - don't the GE installations use EPR?
Also - not sure about the "Nara Japan" comment. There is "Naha" FIR but I don't recall any "Nara".
The fact that such a report hasn't officially surfaced, with comments, certainly makes it suspicious. It's two days old.