Hi Jeroen!
I just ran a save of 5 seasons, which gave the following results (total over 5 seasons):
Ajax: 2 dutch players
PSV: 0 dutch players
Fey: 2 players
In general the amount of transfers the clubs is quite low, but the amount of dutch players being so low feels a bit off..
I cant upload the save game, but can share screenshots if needed. let me know.