Ejcot:
As I said, it's unclear, but it's interesting to try to understand the truth indeed.
Cons:
-As you said, many journalists were on HMS Invincible (if not most of them in fact)
-UK was transparent about the losses, why would the British be suddenly obscure about a hit?
-Likely, the junta needed to appear victorious, hence the false information (see the Russian link with a fake picture: http://www.russiadefence.net/t958-hms-invincible-and-the-malvinas-war-in-1982
Pros:
-Testimonials of 2 Argentinean pilots
-HMS Invincible did not appear in Port Stanley until 2 months after the end of the conflict
-A portion repainted on the right side (when HMS Invincible returner to Portsmouth on Sept. 17 1982)
(Note: for those last two points, I'm basing myself on second hand testimonials, still searching for pics to be honest)
Anyway, aside of the Malvinas/Falklands conflict, this regional war is kind of frightening if you consider the possibility at the time of a conflict with USSR (another rumor: if the US were using their satellites to provide intelligence to UK, some say that USSR was also doing so with Argentina... Strange association indeed, I don't believe it). And I put France in the same bag, even with Exocets (which later sunk USS Stark).
Morality: hopefully the "free world" at that time could count on the US.
If things had turned berzerk for UK, then a land invasion or a nuke?