I always thought he does. He always said he does. Everyone else always said he does. He just admited the first time I know of he dosent know what he is doing -
The guy asks Yngwie about alternate picking at 6:55. He sounds good - better and faster than ever and something about his tone...
Ive done really good with a wierd thing I call directional picking - not strict alternate or only economy. You mix inside and economy string changes in the same lick. Always start the first note with the same direction you move to get to that string. Its faster than alternate - not as fast as only economy. That might be what he's doing. It feels really comfortable. Even inside string changes are more comfortable than outside.