I'm not saying that he only signs Dutch players. I'm saying that he may have too much loyalty to the players that he signed personally over better alternatives.
Also mentioning Brazilians in the context of this discussion is a bit strange, considering that a large percentage of the complaints about EtH involve his inexplicable decision to drop an astronomical sum of money on a Brazilian right winger who doesn't score, create, or threaten generally despite him coaching Antony for two years prior.
That's actually why this discussion is in this thread- some people are questioning whether Amad would get a fair crack next season given that Pellestri hasn't this year despite 9 figure Anto not earning his place at all.