Thats part of the strategy yes, they choose to recruit players that player in EU Clubs yeah. Its a combo of both though, the team that won the under 20 WC isnt really like that.
Not saying there's anything wrong in that btw. Just pointing it out.
Aymeric Laporte, f.ex, is ethnically Basque, but born in France.
He chose to play for the Spanish NT instead of the French NT.
Jerome & Kevin-Prince Boateng are half-brothers born in Berlin.
Jerome played for the German NT & KP played for Ghana NT, the country of his father.
It's a lot more common than what most ppl realize tbf.