Uhh yeah? When Atletico Madrid won the Europa League in 2018, it was a Spanish victory. Their football association received money and ranking boosts by UEFA despite only having 4 Spanish players in their starting XI and only 6 Spanish players in their final squad of 18.
Griezmann (a French player) scored 2 of their 3 goals, should France claim that trophy too? No, it's an organization/region that gets to claim the title.