My recollection is that the BBC said it used material given out at an MOD briefing in London rather than being reported from the Falklands.The bomb thing was a careless reporter, from memory, not a deliberate thing. In the same way that the Paras coming off-axis and advancing on Goose Green caused Col Jones to threaten to sue when he made it back to the UK - because it endangered lives.
Careless, not deliberate. The BBC was a lot more on-side back then (in fact, sitting thinking about it, a comparison in my mind of then and now shows just how far it's drifted).
The general acceptance among the Argentinian military, from what I've read, is that the Belgrano was a legitimate act.
Re the Belgrano; I don't remember whether it was generally accepted at the time as a legitimate target by the Argentine military. However, the CO of Belgrano, the late Captain Hector Bonzo, certainly did think so.