This sounds like a case of folks coming up with silly explanations for their techniques - granted, you would shed fan ice like this, but unless you have flown through proper icing conditions (when you should modulate engine thrust anyway to do just that) thats not a valid point really... The fuel icing problem on the 777 would have been even more catastrophic if they leveled off before capturing the glide wouldn't it? Three miles level, no power, no way to reach the airport.