you have to look those two things differently
I know they were mad then cos they don't like talents to leave holland at early age and they want young players to stay in Holland. Apparently all the big clubs of europe are always at youth games in holland cos everyone knows we have the best youth systems in the world.
The same happen to castagianos, ebicilio, rekik and ake recently and in the past with bruma and van aanholt and with many more which are now playing in the second league in holland.
now about bouy.
I have checked some dutch forums and they say he was not that big of a talent in holland
and feyenoord has way better youth players now a days in everyone eyes
feyenoord produce talent after talent breaking through the first team
ajax youth players are technical skilled just like bouy but aren't mentally ready to play at a higher level.
a few youth players of ajax made they debut this season and they shaked in the knees and making dumb mistakes, while the ones of feyenoord impressed right away and weren't nervous at all. That is why Cruijff was mad at ajax too and wanted to change everything.
Normally the gap between ajax highest youth squad and the first team is very small but now a days it is a huge gap. and that is why I don't think bouy is even close to ready to play in serie a next year. and I don't believe he will be a starter at catania or any other club. Even in serie B he would struggle probably not because of his technical skills but just because he isn't ready at all. But he maybe he proves me wrong but I highly doubt it.