He annihilated the minors while always being one of the youngest players in the league. It's not unreasonable for someone who's always been way better than his peers while being substantially younger to think they can do it well at the highest level.
How on earth did that carry 419 feet despite only being 94.4 mph off the bat? There must be a crazy gust of wind heading in that direction, or the EV read is off.
You realize the nice thing about only letting Romano throw 10 pitches is that he'll be available for the next game right? Could you imagine not even having him available if he goes out for a second inning?