Cool stuff - I have seen Paul Gilbert do some yelping upstroke notes - but they don’t sound like P.H.'s more like a hybrid of P.H.s and scratchy scraping. Don’t know if you could easily do that upstroke P.H. after the super precise alternate muting - but anything is possible on the guitar!
But that riff def’ starts with a upstroke - he says that in the terrifying guitar trip vid
Egg on face moment - I just checked on you tube - at 0.25 speed - yup he starts with a downstroke !!! - that’s this vid:
Also looks like he is full on economy picking the 6 note runs - shocking! lol
I will have to check the metal dog version now - oh dear
yup - looks like metal dog is also starting with a downstroke