We have that result now (Spain winning 3-0),but from what I can tell, I still think they need to see result of France and South Africa. Winner of that match could advance, depending on margin of victory.
This is a horrible format if it's this confusing to know if you're advancing.
Winner of Croatia/Argentina wins their group. Argentina and South Africa can't get through as a 2nd place team
Croatia is through as a 2nd place team if they lose 2-1
France is through as a 2nd place team if they win 3-0 without all matches going to 3 sets
France is through as a 2nd place team if they win 3-0 and Croatia doesn't lose 2-1
Belgium is through as a 2nd place team if Croatia doesn't lose 2-1 OR France doesn't win 3-0 with 2 or less 3 setters
Canada is through as a 2nd place team if Croatia doesn't lose 2-1 AND France doesn't win 3-0