Perhaps I'm missing something but none of the pitches I saw were anywhere close to 90mph nor could I find any videos on YouTube that showed him being pitched to anywhere near that speed. I have seen 5 and 6 year olds in little leagues I have coached in be able to hit soft pitching like those videos showed without any problem.
I noticed also they stated he has the ability to hit the "equivalent of a 90 mph fastball" .. if by that they mean they shorten the distance between pitcher and batter, that's nowhere near an accurate assessment of whether or not he could hit a 90 mph.
Sorry, guess I was looking to be impressed ..
-Reality