I think French develop this « African » talent, they really start young, never bring already established players to the NT. It’s just they bring the strongest, fastest, most talented and willing go to academies. Some are of French ethnicity, most it seems aren’t. But it’s like that since the 70’s, with some gouvernemental sponsored program sponsored by the ministry of sport.
Argentina probably also has ministry of sports I guess, for a fact I know Brazil has it too, but the development is at club level, I guess. Messi is also from Barça’s Massia academy, though he was already a prospect when arrived.