After beating England, Argentine football players waved a banner which said: "The Malvinas Islands (Falkland) belong to Argentina"
(thelemmy.club)
Right but the claim predates Argentina's existence.
The only way Argentina has legitimate claim to the island would be if Spain still maintained the claim to the island at the time Argentina became independent and even then they would have to have to cead the Falkland Islands to Argentina. Which of course never happened.