I think the British having those two carriers could be problematic to our air raids.
But on land, the problem was that the Junta was utterly stupid and sent mainly conscripts who hadn't really trained, from the Northern provinces(where talking about a cold day is saying 15°C), and without supplies or clothes.
And this is serious stuff when doing things in a cold climate. Most of my family is from Chaco, in the North, and when they came here(I live in Ushuaia), they almost literally freeze, they can't leave buildings, even if it's 10°C and they are heavily clothed.
The only real thing that could change the fate of the Invasion would be to sent people from more southern provinces, like Buenos Aires or the Patagonian ones, cloth them well and send the ones who already finished their service, not the ones who just started it.