The RAT on a 777 can provide enough to fly the thing, period.
This looks like both engines, for whatever reason, stopped. In the landing config thats gonna ruin anyones day.
To the muppet that suggested a cocked up approach.... I'd eat my hat, your hat, and everyone else's hat if it came out that was the cause. Or fuel starvation for that matter. We're not talking about bongo bongo airways here for heaven's sake.
I've just remembered why I haven't been on here in years, too many resident retards and not enough people with brains to engage.