Geoff has thrown boiling oil over me, help me, help me, get here now. I am burnt to hell
This tells you nothing about intent. The jury accepted he hadn't thrown the oil but, even if he had, he might not have been aiming at her. It might have been an accident.
The statement isn't necessarily true: she might have been mistaken about what happened (she was apparently intoxicated) or intentionally lying. It sadly cannot be subject to cross-examination, as Mrs Bran died.
Would you be happy to be sentenced to life imprisonment on the basis of a single uncorroborated sentence from an intoxicated woman that was ambiguous as to intent? Flip this round - if it had been a woman who killed in a self-defence situation and her assailant's dying words were "I didn't threaten her- she attacked me unprovoked", would you want her sent down for life, just on his word? Because, if you make it easier to convict, it will apply to everyone, not just unsympathetic defendants like Bran.