@simone.antonello Hi Simone !
Sorry mate but I cannot confirm such a statement. Maybe it was something that used to work on older OSM versions when the scouting system was different too . But from what my personal experience tells me is that this thing about nationality does not stand anymore.
I scout or buy new players of the TL of several nationalities for my squad. What interests me the most is their ratings , age and their prices to be reasonable ones of course.. haha.
I'll leave this topic open to see if another staff or manager has something else to say or add.