Nice strawman.
I said sit on the offspeed (changeup and breaking ball) and "fight off" the fastball. I didn't say it was "easy" - but yes, it is doable. I have done it.
They had issues because they were looking for fastballs and getting changeups. They would have had far LESS trouble (not "no" trouble...his changeup was nasty) had they been geared up for it. Most of his fastballs were well out of the zone. The few that weren't could have been fought off (or hell, just taken...he wasn't using the FB as a 2 strike out pitch anyway), particularly since they were straight as an arrow and usually on the outer half.
Any other questions?
Look, the kid pitched a helluva a game. Of his 16 Ks, about half of them were 100% his doing. The other half were because our hitters had a terrible approach at the plate. The kid isn't Paul Skenes (who, BTW, told several Kentucky hitters what pitch he was throwing and they still couldn't touch it) and was totally hittable had they been looking offspeed/opposite field.