America is in the process of securing an oil deal in the Falklands waters, they don’t need to and they’ll get very trigger happy if the Argentines interfere with the billion dollar deal. Although the Amraams the Typhoons currently carry wouldn’t get a 1:1 missile/kill ratio in a BVR situation… the fact that 4 Tiffies can carry enough Amraams to potentially wipe out 3/4ths of the Argentine fast jet force….should hopefully discourage any silliness on their part. A T45 parked off the coast as close to the airbase would further compound any Argentine air strikes, this ship carries 45 anti air missiles for immediate use and potentially more in storage. Then the airbase itself is defended by short range Rapier SAM’s, squaddies with shoulder launched Starstreak SAMS and a **** load of small arms (which are still dangerous to low flying jets).
The Argie air force would have it’s arse handed to it if they ever attempted anything. Honestly the RAF and Army brass are not that stupid and have made a logical considered approach to defending the islands.