The issue about anti-ship missiles on the T45 class and literal combat capacity I think miss the point. The ships deployment is a visible political move and as so has value above its military capacity. However it is what you don’t see however that really counts.Fitted for, but not with 2 x quad Harpoon launchers
48x Sea Viper
2x Phalanx (I think)
2x 30mm
1x 4.5in gun
Then Lynx/Merlin armed with Sea Skua anti ship missiles/Stingray torpedos or only stingrays respectively
What do you want to bet that there is a royal submarine or two in the area that you cannot see? If so they alone could prevent an amphibious invasion. There is now enough anti-air missile capacity on the island to make an air only invasion unprofitable. Now what exactly is the modern Argentine ASW capacity? And the islands can be quickly reinforced with Air power.
The Argentines are not that stupid to try anything.