I've heard that the judges don't care about race but are often biased on national grounds against people with British sounding names and Chinese people. No idea how true it is. If you have a Spanish name that's probably an advantage
BTW Argentinian constitution says that Argentina welcomes specifically European migration. At least this one is legit as it is the law( even really old one)
On the other hand it all depends on judge.
I know a case there was a european woman who lives 10 + years in Argentina, her religion doesn't allow to say "juro" ( for my US friends here: its typical for Eastern European variations of christianity and maybe Greeks, orthodox etc etc) so she asked to change it to any alternative word. She was denied, the reasoning of the judge: if she doesn't accept the juramento ( there are 3 typical versions of it) as it is she doesn't deserve to be argentine and doesn't need it really" falta de voluntad". Denied.
Btw the guy who played Che Guevara himself Gael Garcia Bernal was denied, and he is Mexican and has Spanish name, ha