ETOPS,
Call me cynical, but when do we ever get a definitive answer from the fleet management!
As with Nod's source, the info came (via A Senior Trg Capt in my case), from Boeing. The info was given to him by one of the Boeing test pilots they got to know whilst doing the course in SEA.
It's obvious you doubt the credibility of the information, that's your prerogative, however, I've no reason to dispute it. After all, i'm sure there's a huge amount of other stuff goes on 'behind the scenes' on the 777 (and probably the Airbus too) that isn't in the Tech Manual or Tech course.................
Cheers for now