I know what youāre asking, but thereās really no need to break your brain on this because Yngwie does exactly what Iām saying he does, and hereās a live performance from 1985 showing it pretty clearly:
You can watch this in slow motion if you want. The YT slow motion feature is not garbage, itās great, and mostly limited by the quality of the footage the people upload. But the sound of the pulloffs is obvious and so are the picking motions, which you can count and actually see when he stops picking for the pulloffs.
Also at about 2:40 there is a nice hand closeup where plays the 4s and 3s pattern on two strings repeating, and if you watch this part in slow motion the picking hand stops picking on the B string to allow the pulloff. Once again, itās obvious.
This is an awesome period performance of YJM in peak form, worth a watch all the way through.